· Olaf
· Oliver
· Omar
· Orlando
· Oscar
· Otto
· Owen
Octopus, Ocean, Orca, Otter, Oyster
An Italian company name that begins with "R" and ends with "o" is Roncato.
Yosemite Yosemite
Adrian
Zack, Zach, Zachary
Freddy
okra
Ohio
Ohio
Georgia O'Keefe was an American artist. Her name begins with the letter O.
Oryx.
Oyster