Names starting with O
96 names starting with O. The tag shows how the name has been used in the US across all years: Boy or Girl when at least 80% of babies with the name were that sex, Both otherwise.
- OaklandBoy
- OakleeGirl
- OakleighGirl
- OaklenBoy
- OakleyBoth
- OaklynGirl
- OaklynnGirl
- ObadiahBoy
- ObedBoy
- ObieBoy
- OceanBoth
- OcieBoth
- OctaviaGirl
- OctavioBoy
- OctaviusBoy
- OdalisGirl
- OdalysGirl
- OdeliaGirl
- OdellBoth
- OdessaGirl
- OdetteGirl
- OdieBoth
- OdinBoy
- OdisBoy
- OfeliaGirl
- OlaGirl
- OlafBoy
- OlanBoy
- OleBoy
- OlenBoy
- OletaGirl
- OlgaGirl
- OlinBoy
- OliveGirl
- OliverBoy
- OliviaGirl
- OllieBoth
- OlympiaGirl
- OlyviaGirl
- OmBoy
- OmaGirl
- OmarBoy
- OmariBoy
- OmarionBoy
- OmegaBoth
- OmerBoy
- OnaGirl
- OnealBoy
- OneidaGirl
- OnieGirl
- OnyxBoth
- OpalGirl
- OpheliaGirl
- OraGirl
- OralBoy
- OraliaGirl
- OranBoy
- OrenBoy
- OriBoy
- OrianaGirl
- OrieBoy
- OrinBoy
- OrionBoy
- OrlandBoy
- OrlandoBoy
- OrphaGirl
- OrrinBoy
- OrsonBoy
- OrvalBoy
- OrvilleBoy
- OsbaldoBoy
- OscarBoy
- OsieBoth
- OsielBoy
- OsirisBoth
- OskarBoy
- OsmanBoy
- OsmarBoy
- OssieBoth
- OsvaldoBoy
- OswaldBoy
- OswaldoBoy
- OthaBoy
- OthoBoy
- OtisBoy
- OttisBoy
- OttoBoy
- OuidaGirl
- OwenBoy
- OzellBoth
- OzellaGirl
- OziasBoy
- OzieBoth
- OzielBoy
- OzzieBoth
- OzzyBoy
Source: US Social Security Administration baby name data, 1880–2024. Counts are Social Security card applications for US births; SSA leaves out names given to fewer than 5 babies in a year. Updated 2026-10-05. How these numbers are made.