Boy Names That Start with O

O names for boys open with a round, full vowel that gives them warmth and presence. Oliver comes from the olive tree and has a long history in English and French, and Owen is a Welsh name with a gentle, friendly sound. Oscar is tied to a warrior of Irish legend and has been used across much of Europe, and Otto is a Germanic name linked to wealth and was carried by medieval emperors.

This letter is especially rich in mythology. Odin is the chief god of Norse mythology, associated with wisdom and poetry, and Osiris is the Egyptian god of the afterlife. Orion is the great hunter of Greek myth who gave his name to one of the brightest constellations in the night sky. Other names add Latin and Spanish flavor. Octavio comes from a Latin word for eighth, Orlando is an Italian form of a Germanic name and a hero of Shakespeare's As You Like It, and Osvaldo is a Spanish and Italian form of an old English name. Omar is an Arabic name, and Onyx is a gemstone.

Because O names begin with a vowel, they can blend into surnames that also start with a vowel. Consider how dramatic you want the name to feel, since Odin and Osiris make a bold statement, while Otis and Owen are quieter.