O Male
OB - (Outer Banks origin) OB is short for "Outer Banks."
Olaf - (Old Norse) Olaf is a variant of Olafr, meaning "Ancestral Heritage."
Oliver- (Old Norse) Oliver is a variant of Aleifr that means "Ancestor's Descendant."
Ollie - (Latin origin) Ollie means "Olive Tree."
Onyx - (English origin) Onyx means "Black Gemstone."
Opie - (Norse-Viking origin) Opie means "Son of Asbjorn."
Orion - (Greek Mythology) Orion was a "Mighty Hunter."
Oscar - (Irish origins) Oscar has a compound meaning of Os, meaning "Deer," and Car meaning "Friend."
Ozzy - (German origin) Ozzy means "Divine Power."