Baby Names That Start With O, Girls and Boys

Popular O names for girls

Olivia (Latin, meaning olive tree, currently one of the most popular girls’ names in the country)
Opal (English, from the gemstone)
Olive (English, from the tree, and a shorter relative of Olivia)

Oliver (disputed etymology, most commonly read as meaning olive tree; see our full Oliver name meaning page for the different theories)
Owen (Welsh, commonly read as meaning young warrior or well born)
Otto (Germanic, meaning wealth or fortune)
Otis (English, an occupational surname meaning son of Otto)

Oakley (English, originally a surname meaning oak field, used for both boys and girls)


Common origins	Latin, Welsh, Germanic, English
Common meaning themes	wealth, nature (olive, oak), strength
Note	Olivia currently ranks as the most popular girls’ name in the country

What is the most popular baby name starting with O?

Olivia is currently the most popular girls’ name overall in the country, while Oliver and Owen are both strong choices for boys.

Is Oakley used more for boys or girls?

It’s used across both, with the balance shifting depending on the specific year and country.