551 Boy Names That Start With O (with Meanings and Popularity)

Oleander

Botanical name

Olef

Oleg

Russian

"holy"

Olek

Oleksa

Ukrainian variation of Alexander

"defending men"

Olen

Variation of Ole and Olena, Scandinavian, Russian, Dutch, "ancestor's relic; eagle; pebbly forest"

"ancestor's relic; eagle; pebbly forest"

Olev

Olexei

Greek

"defending men"

Olexi

Greek

"defending men"

Oley

Olezka

Oli

Latin, English

"olive tree"

Olie

Olier

Olimios

Olimpio

Greek

"pertaining to the Mount Olympus of Greek mythology"

Olimpo

Olinn

Olivander

Compound name, Oliver plus Alexander, Latin and Greek

"olive tree and defending men"

Oliverio

Spanish form of Oliver, Latin

"olive tree"