OAKES (English) Oak tree. Variations: Oak, Ochs.

OAKLEY (English) Meadow of oak trees. Variations: Oaklee, Oakleigh, Oakly.

OBA (African) King.

OBADIAH (Hebrew) Servant of God. Variations: Obadias, Obe, Obed, Obediah, Obie, Ovadiach, Ovadiah.

OBASI (African) Honoring God.

OBERON (German) Noble and bearlike. Variations: Auberon, Auberron.

OBERT (German) Wealthy and brilliant.

OCEAN (English) Ocean. Variations: Oceanus.

OCTAVIUS (Latin) Eighth child. Variations: Octave, Octavian, Octavien, Octavio, Octavo, Ottavio.

ODAKOTA (Native American) Friends.

ODELL (English) Forested hill. Variations: Ode, Odey, Odi, Odie.

ODHRAN (Irish) Pale green. Variations: Odran, Oran.

ODIN (Scandinavian) Inspiration and rage.

ODOLF (German) Wealthy wolf. Variations: Adolf, Odolff.

ODYSSEUS (Greek) Full of wrath. Notables: Trojan War leader Odysseus.

OG (Aramaic) King. Notables: Writer/speaker Og Mandino.

OGDEN (English) Valley of oak trees. Notables: Writer Ogden Nash. Variations: Ogdan, Ogdon.

OISIN (Irish) Young deer. Variations: Ossian, Ossin.

OISTIN (Irish) Respected.

OLAF (Scandinavian) Forefather. Variations: Olaff, Olav, Olave, Olen, Olin, Olof, Olov, Olyn.

OLDRICH (Czech) Noble king. Variations: Olda, Oldra, Oldrisek, Olecek, Olouvsek.

OLEG (Russian) Holy. Notables: Fashion designer Oleg Cassini. Variations: Olezka.

OLERY (French) Leader.

OLIN (English) Holly. Variations: Olen, Olney.

OLIVER (Latin) Olive tree. Notables: Comedian Oliver Hardy; film director Oliver Stone. Variations: Oliverio, Olivero, Olivier, Olivor, Olley, Ollie, Olliver, Ollivor.

OLNEY (English) Town in Britain.

OMAR (Arabic) High follower of the Prophet. Notables: Actor/bridge expert Omar Sharif; General Omar Bradley; poet Omar Khayyam. Variations: Omarr, Omer.

OMRI (Hebrew) Bundle of grain.

ONAN (Turkish) Wealthy.

ONDREJ (Czech) Manly. Variations: Ondra, Ondravsek, Ondrejek, Ondrousek.

O'NEIL (Irish) Son of Neil. Variations: O'Neal, Oneal, Oneil, O'Neill.

ONSLOW (English) Fan's hill. Variations: Ounslow.

ONUR (Turkish) Honor.

ORAL (Latin) Verbal. Notables: Religious leader Oral Roberts.

ORBAN (Hungarian) Urbanite.

ORDELL (Latin) Beginning.

OREN (Hebrew) Pine tree. Notables: U.S. Senator Orrin Hatch Variations: Orin, Orran, Orren, Orrin.

ORESTES (Greek) Mountain. Variations: Aresty, Oreste.

OREV (Hebrew) Raven.

ORFORD (English) Ford of cattle.

ORI (Hebrew) My light. Variations: Orie, Oron, Orrie, Orry.

ORION (Greek) Son of fire or light.

ORLANDO (Italian) Famous land. Notables: Actor Orlando Bloom. Variations: Ordando, Orland, Orlande, Orlo.

ORMAN (English) Spearman.

ORMOND (German) Serpent. Variations: Ormande, Ormonde, Ormondo.

ORPHEUS (Greek) Dark of night.

ORRICK (English) Old oak tree. Variations: Orric.

ORSON (Latin) Bearlike. Notables: Actors Orson Welles and Orson Bean. Variations: Orsen, Orsin, Orsini, Orsino.

ORTON (English) Shore town.

ORUNJAN (African) Born under the noontime sun.

ORVILLE (French) Golden town. Notables: Aviator Orville Wright; popcorn maker Orville Redenbacher. Variations: Orv, Orval, Orvell, Orvelle, Orvil.

ORVIN (English) Friend with a spear. Variations: Orwin, Orwynn.

OSBERT (English) Divine and bright.

OSBORN (English) Divine bear. Variations: Osborne, Osbourn, Osbourne, Osburn, Osburne.

OSCAR (English) Divine spear. Notables: Writer Oscar Wilde; composer Oscar Hammerstein; boxer Oscar de la Hoya; fashion designer Oscar de la Renta. Variations: Oskar, Osker, Ossie.

OSGOOD (English) Divine and good. Variations: Oz, Ozzi, Ozzie, Ozzy.

O'SHEA (Irish) Son of Shea. Variations: Oshay, Oshea.

OSMAN (Turkish) Ruler.

OSMAR (English) Divine and marvelous.

OSMOND (English) Divine protector. Variations: Osman, Osmand, Osmonde, Osmund, Osmunde.

OSRIC (English) Divine ruler. Variations: Osrick.

OSTIN (Latin) Esteemed. Variations: Austin, Osten, Ostyn.

OSWALD (English) Divine power. Variations: Ossie, Osvald, Oswaldo, Oswall, Oswell.

OSWIN (English) Divine friend. Variations: Osvin, Oswinn, Oswyn, Oswynn.

OTHELLO (Spanish) Form of Otis.

OTIS (English) Son of Otto.

OTTAH (African) Skinny boy.

OTTO (German) Wealthy. Notables: Film director Otto Preminger; German Chancellor Otto von Bismarck. Variations: Odo, Otello, Othello, Otho, Othon, Oto, Ottomar.

OVED (Hebrew) Worshiper. Variations: Obed.

OVID (Latin) Sheep. Notables: Roman poet Ovid (Publius Ovidius Naso).

OWEN (Welsh) Well born. Notables: Actor Owen Wilson. Variations: Owain, Owin.

OXFORD (English) Oxen river crossing.

OZ (Hebrew) Power.

OZZY (English) Short for Osborne or Osgood. Notables: Rock singer Ozzy Osborne; actors Ossie Davis and Ozzie Nelson. Variations: Ossie, Ossy, Ozzie.