Boy Names Starting with O

Well-Known and Rare First Names Starting with O

• Octavio: A name with Latin roots. It traces back to the Roman family name Octavius, whose documented meaning is "the eighth."
• Odin: Traces back to Norse mythology, where he is the chief god.
• Olaf: The name comes from Old Norse (Áleifr). Its documented etymology combines elements meaning "ancestor" and "descendant."
• Ole: A Scandinavian and Low German short form, mostly derived from Olaf, and less commonly from Ulrich.
• Oleg: The Russian and Ukrainian form of the Scandinavian name Helge. The Old Norse root means "holy" or "blessed."
• Oliver: Oliver goes back to the Old French form Olivier. Its older origin is not conclusively clarified. Both a connection to the Latin oliva, "olive tree," and a Germanic origin are discussed. "Peace" is a symbolic association, not a definitively established literal meaning.
• Omar: An Arabic first name. Its documented root means "flourishing" or "long-lived."
• Omid: This name comes from Persian and translates to "hope."
• Onno: A Frisian short form. The older linguistic meaning of this name family is not definitively clear; a connection to the Old Saxon word for "to grant" is often suspected.
• Orell: The Romansh and Swiss form of the Latin name Aurelius. The Latin root means "golden" or "made of gold."
• Orhan: A Turkish name formed from elements meaning "army" or "city" and the title of ruler "Han" (Khan).
• Orion: Comes from Greek mythology, where Orion is a giant hunter who was placed in the heavens as a constellation.
• Orlando: The Italian form of the Old High German name Roland. The word elements stand for "fame" and "land."
• Orson: An English name with Norman-French roots. Its documented meaning is "bear cub."
• Oskar: Several histories are documented for this name. It is often interpreted as an Old English name (Osgar, "spear of the gods"), but it can also have Irish roots, where a widespread translation is "friend of deer."
• Osman: An Arabic and Turkish first name. It originally referred to a type of bird (bustard) and is historically best known as the name of the founder of the Ottoman Empire.
• Oswald: Composed of the Old High German words for "god" (Os) and "to rule" (waltan).
• Otis: An English first name that was originally a surname. It traces back to the given names Ode or Otto.
• Otto: An Old High German name. It originated as a short form of names beginning with "Ot-". The root means "possession," "heritage," or "wealth."
• Ousmane: The West African form of the Arabic name Osman, frequently given in countries like Senegal or Mali.
• Ove: A Scandinavian first name. Its precise origin is unclear; it could be a variant of Uwe or trace back to Old Norse words for "blade" or "sword."
• Ovid: Traces back to the Roman family name Ovidius. The Latin root word is "ovis" (sheep).
• Owen: Owen is an Anglicized form of the Welsh Owain or the Irish Eoghan. The older meaning of these names is not definitively clarified. A connection to the Latin Eugenius is one of several explanations.
• Oz: A short Hebrew first name. Its documented meaning is "strength" or "might."
• Ozan: A Turkish first name. Its documented meaning is "poet" or "bard."
• Ozzy: An English diminutive, most often used for names like Oswald or Osborne.

Paying Attention to Rhythm and Initials

When you choose a first name starting with O, it pays to consider the pronunciation. The O can be pronounced short and crisp (as in Otto or Onno) or long and soft (as in Olaf or Ozan). A short O often pairs nicely with longer last names, while a long O can soften a harsh-sounding surname.

Also check the initials formed by the first name and your last name. Combinations like O. K. are generally unproblematic, while O. O. can be visually striking. For names like Oskar or Oscar, you also have the choice between the German and international spelling. Consider which variant will require fewer explanations in your everyday life.

In HeyName, you can try out first names directly alongside your last name and an optional middle name. That way, you immediately see how the written name looks and whether the cadence appeals to you.

How to Narrow Down Your Selection

Talk together about which style of O names appeals to you most. Do you prefer traditional German names, Scandinavian short forms, or international variants? By rating names independently of one another, you can focus on your shared favorites afterward. Then, using a shortlist of two or three names, discuss which one best fits your family.

Editorial update: September 22, 2026

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