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Names That Start with O

136 names

O opens with a round vowel, and names that start with it often feel full and warm. Many of them have literary roots. Olivia, Ophelia and Orlando all appear in plays by Shakespeare, in Twelfth Night, Hamlet and As You Like It. Octavia is the feminine form of a Latin name related to the word for eighth, and Oscar was given a lift by Irish legend and later by a famous playwright.

Myth and the night sky contribute too. Odin is the chief god of Norse mythology, and Orion is the hunter of Greek myth who was placed among the stars as a constellation. Otto is a Germanic name carried by medieval emperors.

Nature names are also common. Olive and Oliver both connect to the olive tree, a symbol of peace, while Oakley and Oaklynn draw on the oak. Owen is a Welsh name, and Omar and Omari have Arabic and East African connections. O names can blend into surnames that begin with a vowel, so say the full name aloud. On the other hand, a name like Owen or Olive sits well beside a last name that starts with a firm consonant.

Most popular right now

Olivia Girl
oh-LIH-vee-uh
“olive” · Latin
#1
Oliver Boy
AH-luh-vur
“olive tree” · French
#3
Owen Boy
OH-uhn
“possibly well born” · Welsh
#31
Oscar Boy
AWS-kur
“possibly deer friend” · Irish
#223
Omar Boy
OH-mahr
“long-lived; flourishing” · Arabic
#260
Oakley Unisex
OHK-lee
“oak clearing” · English
#156
Olive Girl
AH-lihv
“olive tree” · English
#197
Orion Boy
oh-RY-uhn
“name of a mythological hunter” · Greek
#334
Odin Boy
OH-duhn
“fury, inspiration” · Old Norse
#502
Oaklynn Girl
OHK-lin
“modern blend of oak and Lynn” · American (modern coinage)
#153

All 136 names

Sorted by current popularity. US rank uses 2025 data for the name's most common sex; the trend compares births with five years earlier. Tap a column heading to re-sort.

Name Sex Meaning Origin US rank 2025 5-yr trend
Olivia Girl olive Latin 1 ↓ -23%
Oliver Boy olive tree French 3 → +5%
Owen Boy possibly well born Welsh 31 ↓ -17%
Oscar Boy possibly deer friend Irish 223 ↓ -8%
Omar Boy long-lived; flourishing Arabic 260 → -4%
Oakley Unisex oak clearing English 156 ↑ +71%
Olive Girl olive tree English 197 ↑ +7%
Orion Boy name of a mythological hunter Greek 334 → -0%
Odin Boy fury, inspiration Old Norse 502 ↓ -39%
Oaklynn Girl modern blend of oak and Lynn American (modern coinage) 153 ↑ +89%
Otto Boy wealth Germanic 277 ↑ +57%
Ophelia Girl help Greek 264 ↑ +49%
Octavia Girl eighth Latin 308 ↑ +6%
Orlando Boy famous land Italian 873 ↓ -10%
Omari Boy Swahili form of Omar; life, flourishing Swahili 687 ↓ -32%
Onyx Boy claw, fingernail; the gemstone Greek 365 ↑ +97%
Ocean Unisex ocean, the sea English 720 ↑ +28%
Oaklee Girl oak meadow American (modern coinage) 535 ↑ +20%
Opal Girl opal, the gemstone Sanskrit 423 ↑ +66%
Oaklyn Girl blend of Oak and Lynn American (modern coinage) 637 ↓ -13%
Otis Boy wealth English 652 → +2%
Osvaldo Boy divine power Spanish 1,408 ↑ +6%
Oakleigh Girl oak clearing American (modern coinage) 668 ↑ +34%
Ozzy Boy short for Oswald or Osborne English 549 ↑ +184%
Ollie Unisex short form of Oliver or Olivia English 1,058 ↑ +23%
Octavio Boy eighth Spanish 1,278 ↑ +17%
Osiris Boy — Egyptian 1,077 ↓ -18%
Osman Boy Turkish form of Uthman Turkish 1,157 ↑ +9%
Oskar Boy uncertain; possibly deer friend Irish 1,750 ↓ -35%
Oren Boy pine tree Hebrew 1,184 ↑ +37%
Oswaldo Boy god and rule; Spanish form of Oswald Spanish 3,027 ↓ -20%
Ozias Boy Greek form of Uzziah, God is my strength Hebrew 708 ↑ +277%
Odette Girl wealth, fortune French 883 ↑ +109%
Oziel Boy God is my strength Spanish 997 ↑ +190%
Oriana Girl uncertain; perhaps 'golden' Latin 1,791 ↑ +38%
Omarion Boy blend of Omar and Marion American (modern coinage) 2,560 ↓ -30%
Osiel Boy form of Uzziel, 'God is my strength' Spanish 1,454 ↑ +76%
Om Boy sacred syllable of Hinduism Sanskrit 2,177 ↓ -14%
Obed Boy servant, worshipper Hebrew 2,072 ↑ +6%
Odessa Girl from the Ukrainian city Odessa Greek 1,197 ↑ +47%
Ozzie Boy pet form of Oswald or Osborn English 1,455 ↑ +43%
Olin Boy from an English surname, meaning uncertain English 1,849 → -3%
Olyvia Girl variant of Olivia, olive tree American (modern coinage) 3,283 ↓ -26%
Obadiah Boy servant of God Hebrew 1,630 → -1%
Oakland Boy oak land, from the California city English 1,248 ↑ +40%
Osmar Boy divine fame Germanic 2,345 ↑ +11%
Ori Unisex my light Hebrew 2,002 ↑ +27%
Orin Boy little pale green one Irish 1,859 → +2%
Omer Boy sheaf of grain Hebrew 2,103 → -1%
Olga Girl holy, blessed Russian 3,201 ↓ -7%
Orson Boy little bear cub French 1,433 ↑ +21%
Ofelia Girl Spanish form of Ophelia, help Spanish 2,148 → +2%
Oona Girl from Irish Úna, possibly lamb or unity Irish 2,768 ↓ -18%
Oden Boy Swedish form of Odin, chief Norse god Old Norse 2,033 ↓ -9%
Olivier Boy French: olive tree French 2,559 ↑ +11%
Octavius Boy eighth Latin 2,073 ↓ -15%
Orrin Boy uncertain; perhaps Irish pale green Irish 2,278 → +3%
October Girl the month; from Latin for eighth English 3,758 ↓ -29%
Odalys Girl Spanish-American name of uncertain origin Spanish 3,821 ↑ +86%
Olympia Girl from Olympia, sanctuary of Zeus Greek 2,210 ↑ +20%
Octavian Boy from Latin Octavius, "eighth" Latin 2,592 → +2%
Orianna Girl golden Latin 3,094 ↑ +47%
Osbaldo Boy Spanish form of Oswald; divine power Spanish 6,348 ↓ -18%
Oshea Boy variant of O'Shea, descendant of Séaghdha Irish 2,507 ↑ +12%
Oryan Boy modern Hebrew name, light Hebrew 3,289 → 0%
Odalis Girl modern Spanish name, uncertain origin Spanish 9,306 ↓ -8%
Orla Girl golden princess Irish 2,532 ↑ +119%
Oswald Boy god power Old English 2,161 ↑ +72%
Omega Unisex last letter of the Greek alphabet Greek 4,016 ↓ -39%
Olen Boy uncertain; possibly variant of Olin — 3,489 ↓ -11%
Oceana Girl ocean Latin 3,562 ↑ +59%
Odelia Girl praise God, or wealthy Hebrew 2,985 ↑ +51%
Ora Girl light (Hebrew) or pray (Latin) Hebrew 3,760 ↑ +18%
Octavious Boy variant of Octavius, "eighth" American (modern coinage) 5,546 ↓ -32%
Ona Girl Lithuanian form of Anna, "grace" Hebrew 5,868 → -4%
Odell Boy from an English place name, 'woad hill' Old English 4,495 ↓ -26%
Oliva Girl olive; variant of Olivia Latin 7,059 ↓ -30%
Ottilie Girl fortune, wealth German 2,951 ↑ +200%
Oran Boy little pale green one Irish 5,153 ↑ +27%
Otoniel Boy Spanish form of Othniel Hebrew 6,069 ↓ -38%
Olan Boy uncertain; possibly Irish or Norse Irish 6,345 ↓ -33%
Oksana Girl Slavic form of Xenia, hospitality Russian 7,404 ↑ +15%
Orlin Boy uncertain; possibly a variant of Orland — 4,662 ↑ +10%
Ole Boy ancestor's heir Norwegian 4,820 ↓ -9%
Obie Boy short form of Obadiah or Obed English 8,065 ↓ -17%
Orville Boy gold town French 6,347 ↑ +17%
Ola Girl several possible sources Norwegian 8,227 ↓ -7%
Ovidio Boy Spanish and Italian form of Ovid Spanish 4,351 ↑ +100%
Oneil Boy from the surname O'Neill Irish 10,405 ↓ -12%
Oralia Girl uncertain, possibly golden Spanish 8,737 ↑ +20%
Olaf Boy ancestor's heir Old Norse 13,369 ↓ -29%
Onalee Girl blend of Ona and Lee American (modern coinage) 11,664 ↓ -33%
Osborne Boy god bear English 4,663 → 0%
Odis Boy variant of Otis, wealth English 6,065 ↓ -29%
Otilia Girl form of Ottilie, wealth Spanish 6,492 ↑ +64%
Oneal Boy variant of O'Neill, descendant of Niall Irish 11,642 ↓ -50%
Ottis Boy variant of Otis, wealth Germanic 6,070 ↑ +67%
Orie Boy — — 7,545 ↑ +83%
Ocie Unisex — — 6,055 new
Odilia Girl wealth, fortune Germanic 7,058 ↑ +167%
Odie Boy pet form of Odell or Otis English 5,547 ↑ +143%
Olevia Girl variant of Olivia, olive Latin — new
Oneida Girl name of an Iroquois nation Native American — new
Ozella Girl uncertain, modern Southern name American (modern coinage) 12,853 ↓ -53%
Orvin Boy uncertain, possibly spear friend English — ↓ -100%
Ozell Boy uncertain, modern Southern name American (modern coinage) 13,387 ↓ -17%
Ova Girl uncertain, vintage Southern name American (modern coinage) — ↓ -100%
Orland Boy variant of Orlando or Roland Germanic — ↓ -100%
Otha Boy uncertain, perhaps from Otto Germanic — new
Orpha Girl variant of Orpah Hebrew — new
Oma Girl uncertain; possibly Arabic, commander — — new
Olinda Girl uncertain; possibly Germanic Portuguese — new
Ossie Boy pet form of Oswald or Oscar English — new
Oleta Girl uncertain; possibly from Alethea American (modern coinage) — new
Omie Girl uncertain; possibly a pet form of Naomi American (modern coinage) — new
Ottie Girl pet form of Ottilie or Otto Germanic — new
Onnie Girl old pet name, origin uncertain English — new
Oris Boy origin uncertain English — new
Ozie Boy pet form of Oswald or Ozias English — new
Orval Boy variant of Orville French — new
Ouida Girl childish form of Louisa English — new
Otho Boy Latin form of Otto, wealth Germanic — new
Oral Boy — American (modern coinage) — new
Osie Unisex uncertain pet form American (modern coinage) — new
Onie Girl uncertain pet form American (modern coinage) — new
Orvil Boy variant of Orville French — new
Oda Girl Germanic, wealth German — new
Oneta Girl uncertain; American coinage American (modern coinage) — new
Okey Boy uncertain; English surname or Igbo short form English — new
Olene Girl uncertain; American name American (modern coinage) — new
Oletha Girl uncertain; American coinage American (modern coinage) — new
Otelia Girl variant of Otilia, wealth Spanish — new
Onita Girl uncertain; American name American (modern coinage) — new
Oretha Girl uncertain; related to Aretha American (modern coinage) — new
Orvel Boy variant of Orville American (modern coinage) — new
Orene Girl uncertain; American name American (modern coinage) — new