The letter “O” offers a bold, open, and optimistic sound for modern baby boy names. In the American naming landscape, “O” names range from timeless classics with deep roots to fresh, modern inventions that feel both strong and approachable. These names often carry meanings of heritage, strength, and new beginnings, making them wonderful choices for a son.
This list features over 100 wonderful American baby boy names starting with O. Each name has been selected for its positive meaning, pleasant sound, and versatility, perfect for a boy growing up in the modern United States.
The Ultimate List of Wonderful “O” Names for American Boys
Page Contents
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Oak – “Oak tree” – A strong, single-syllable nature name.
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Oakland – “Land of oaks” – A cool, place-based name.
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Oakley – “Meadow of oak trees” – A unisex surname-name with a friendly, outdoorsy feel.
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Oaklyn – A modern variant of Oakley.
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Oaks – A strong, nature-inspired surname.
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Oban – “Little bay” – A Scottish place-name.
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Oberon – “Noble, bear-like” – The king of the fairies in Shakespeare.
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Ocean – “Sea” – A vast, serene, and powerful nature name.
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Octavio – The Spanish form of Octavius.
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Octavius – “Eighth” – A distinguished ancient Roman name.
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October – The tenth month, a cool, autumnal word name.
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Odell – “Wood hill” – A melodic surname-name.
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Oden – A variant of Odin or a modern name.
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Odin – “Fury, inspiration” – The chief Norse god, powerful and mythological.
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Odis – A variant of Otis.
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Odysseus – “To hate” – The heroic voyager from Greek myth.
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Ogden – “Oak valley” – A distinguished English surname-name.
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Oisin – “Little deer” – A legendary Irish poet-warrior name (pronounced O-SHEEN).
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Olaf – “Ancestor’s relic” – A strong Scandinavian royal name.
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Olan – A name of Irish or Norse origin.
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Ole – The Scandinavian diminutive of Olaf.
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Oleg – “Holy” – A Russian and Slavic name.
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Oli – A friendly short form of Oliver.
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Olin – “Holly” or “ancestor’s relic” – A sturdy name of multiple origins.
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Oliver – “Olive tree” – A perennially popular, friendly, and strong classic.
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Ollie – The universally loved nickname for Oliver.
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Olmstead – “Place of elms” – A rare English topographic surname.
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Olu – “God” – A Yoruba (Nigerian) prefix used as a short name.
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Olujimi – “God gives me” – A Yoruba name.
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Omar – “Flourishing, long-lived” – A cross-cultural Arabic name.
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Omari – A Swahili variant of Omar.
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Omer – “Sheaf of wheat” – A Hebrew name.
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Onslow – “Zeal’s hill” – A rare English surname.
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Oran – “Pale, green” – A simple Irish name.
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Orion – “Rising in the sky” – A mighty constellation name, cool and celestial.
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Orlando – “Famous land” – The Italian and Spanish form of Roland, literary and romantic.
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Orleans – “Golden” – The famous French and American city name.
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Orlin – “Gold” – A variant of Orland.
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Orson – “Bear cub” – A strong, vintage name with a friendly edge.
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Orville – “Gold town” – A vintage inventor’s name (the Wright brothers).
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Osbaldo – The Spanish form of Osbald.
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Osborn – “Divine bear” – A strong English surname-name.
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Osbourne – A variant spelling of Osborn.
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Oscar – “Friend of deer” or “God’s spear” – A classic, friendly name with Irish and Norse roots.
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Osgood – “Divine god” – A rare, virtuous Old English name.
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Oshea – A variant of O’Sullivan or Josiah.
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Oskar – The German and Scandinavian spelling of Oscar.
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Osman – “Turtledove” – An Arabic and Turkish name.
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Osmond – “Divine protection” – A distinguished, vintage name.
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Ossian – The anglicized form of Oisin.
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Oswald – “Divine power” – A saintly, vintage English name.
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Oswin – “Divine friend” – A rare and gentle Old English name.
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Otis – “Wealthy” – A cool, vintage name with soulful musical ties.
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Otto – “Wealth, fortune” – A strong, succinct, and stylish German name.
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Ove – “Edge of a sword” – A short, sharp Scandinavian name.
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Ovid – “Sheep herder” – An ancient Roman poet’s name.
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Owen – “Young warrior, noble” – A friendly, strong, and enduring Welsh classic.
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Owain – The original Welsh form of Owen.
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Oxford – “Ford of the oxen” – A prestigious university and city name.
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Oz – “Strength” – A short, punchy Hebrew name or a literary nickname.
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Ozan – “Bard, poet” – A Turkish name.
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Ozzie – The affectionate nickname for names like Oswald or Oscar.
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Ozzy – The rock-and-roll spelling of Ozzie.
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Oak – Repeated for its pure, strong nature vibe.
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Oakden – A rare variant meaning “oak valley.”
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Oakford – “Ford by the oaks” – A constructed place-name.
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Oaken – A modern variant of Oaken or related to oak.
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Oakes – Repeated for its surname-style strength.
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Oaklan – A modern spelling variant of Oakland.
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Oaklen – A modern invented name.
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Oaklin – A modern invented name.
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Oakson – “Son of Oak” – A modern invented patronymic.
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Obadiah – “Servant of God” – A distinctive biblical prophet’s name.
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Oban – Repeated for its Scottish coastal charm.
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Obediah – A variant spelling of Obadiah.
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Oberyn – A modern invented name, popularized by Game of Thrones.
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Oceanus – The ancient, grand form of Ocean.
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Ocie – A rare, vintage name.
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Octavian – “Eighth” – The more common form of Octavius.
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Odal – A rare name, from the Norse rune Othala meaning “heritage.”
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Ode – “Song, poem” – A short, artistic word name.
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Odel – A variant of Odell.
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Oden – Repeated for its connection to the Norse god.
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Odie – A friendly, vintage nickname.
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Odin – Repeated for its powerful mythological weight.
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Odion – “First of twins” – A Nigerian (Edo) name.
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Odom – “Son of Otto” – A surname.
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Ody – A short form of Odysseus or Odin.
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Olan – Repeated for its simple, international sound.
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Oleander – A beautiful but poisonous flowering shrub, a bold nature name.
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Olek – The Polish diminutive of Alexander.
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Olen – A variant of Olin or Olan.
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Olindo – A literary name from Italian epic poetry.
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Olive – Historically masculine, from Oliver.
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Olivier – The French form of Oliver.
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Olliver – A creative spelling of Oliver.
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Olman – A rare surname.
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Olney – “Olaf’s island” – An English place-name.
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Olsen – “Son of Ole” – A Scandinavian patronymic surname.
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Olus – A short form of Yoruba names like Olusegun.
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Oluwaseun – “God is gracious” – A Yoruba name.
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Oluwatobi – “God is great” – A Yoruba name.
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Oman – The country name.
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Omarion – A modern elaboration of Omar.
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Omega – “The great O” – The last letter of the Greek alphabet, a bold word name.
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Omen – A mysterious word name.
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Omri – “Sheaf of grain” – A biblical king’s name.
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Onan – “Strong” – A rare biblical name.
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Oneal – A variant of O’Neill.
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Onix – A variant spelling of Onyx.
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Ono – A short, Japanese or surname name.
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Onyx – “Black gemstone” – A cool, sleek mineral name.
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Opie – A friendly, vintage nickname.
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Opio – “Second born of twins” – An African (Luo) name.
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Oran – Repeated for its simple, Irish charm.
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Orazio – The Italian form of Horace.
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Orban – “From the city” – A Hungarian name.
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Orel – “Light of God” – A Hebrew name.
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Oren – “Pine tree” – A strong, nature-based Hebrew name.
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Orestes – “Of the mountains” – A figure from Greek tragedy.
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Orhan – A Turkish name.
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Ori – “My light” – A short, beautiful Hebrew name.
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Orin – A variant of Oren.
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Orion – Repeated for its stellar coolness.
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Orlondo – A variant of Orlando.
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Orman – “Spearman” – A surname.
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Orren – A variant of Oren or Orrin.
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Orrin – A variant of Oren or an Anglicized form of Odhrán.
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Orry – A diminutive of names like Orville.
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Orson – Repeated for its strong, vintage charm.
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Orton – “Settlement on the shore” – An English place-name.
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Orval – “Spear strength” – A rare vintage name.
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Orville – Repeated for its inventive, vintage feel.
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Orvin – “Spear friend” – A rare English name.
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Os – A very short nickname or name.
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Osaze – “God chooses” – A Nigerian (Edo) name.
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Osbert – “Divinely bright” – A rare, vintage English name.
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Osborn – Repeated for its strong, bear-related meaning.
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Oscar – Repeated for its friendly, classic stature.
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Osiris – The Egyptian god of the afterlife, a bold mythological choice.
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Osmar – “Divinely famous” – A rare name.
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Osred – An ancient Anglo-Saxon king’s name.
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Osric – “Divine ruler” – An ancient Anglo-Saxon name.
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Ossie – A nickname for Oswald or Osborne.
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Ossy – A variant of Ossie.
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Ostin – A modern spelling variant of Austin.
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Oswald – Repeated for its saintly, vintage strength.
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Oswell – A rare variant of Oswald.
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Oswin – Repeated for its gentle, virtuous meaning.
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Othello – “Wealth” – The tragic Shakespearean Moor.
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Otis – Repeated for its soulful, vintage cool.
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Ottah – A rare name.
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Ottaway – A rare English surname.
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Otto – Repeated for its strong, stylish brevity.
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Ove – Repeated for its sharp Scandinavian edge.
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Oved – “Servant, worshipper” – A Hebrew name.
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Ovidio – The Italian and Spanish form of Ovid.
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Owen – Repeated for its enduring, wonderful popularity.
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Owens – “Son of Owen” – A surname-name.
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Oxford – Repeated for its academic prestige.
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Owin – A variant of Owen.
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Owynn – A creative spelling of Owen.
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Oz – Repeated for its short, powerful punch.
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Oza – A very rare name.
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Ozair – A variant of the Arabic name Uzair (Ezra).
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Ozan – Repeated for its poetic Turkish meaning.
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Ozias – A Greek form of the Hebrew name Uzziah.
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Ozni – “My hearing” – A rare biblical name.
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Ozra – A rare biblical name.
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Ozuru – A Japanese name meaning “big stork.”
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Ozz – An edgy spelling of Oz.
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Ozzard – A rare surname.
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Ozzwald – An archaic spelling of Oswald.
Why Choose a Wonderful “O” Name for Your Son?
“O” names are open, optimistic, and often carry a strong, resonant sound. They can be nature-inspired (Oak, Ocean, Orion), classic and friendly (Oliver, Owen, Oscar), or vintage and cool (Otis, Otto, Orson). They work well in the diverse American context and often have meanings connected to strength, heritage, and nobility. A wonderful “O” name gives a boy a distinctive and positive start.
Final Thoughts
Finding the right name is about the feeling it evokes. Does it sound strong with your surname? Does it have a nickname potential you love? A name like Oliver feels timeless and kind, Orion feels cosmic and adventurous, and Otis feels soulfully cool. Whether you choose the friendly Owen, the strong Oak, or the mythological Odin, a wonderful “O” name is a gift of character and bright potential for your son.
