Ota, as in Taishi Ota.
No the answer for a crossword puzzle is MEL "OTT" of the old time Baseball team New York Giants
Ozzy ozborn
There is none that starts with an O, but the Lincoln memorial fits that description
Ollie Murs
Ono?
Very few words start with o. Famous word aum starts with a but not o.
Ozzy Osbourne. Osbourne is a famous singer, actor and songwriter.
Roy Orbison
"one direction that makes you beautiful" is one
ouch...
oasis
oprah winfrey
Shaquille O'Neal is a famous basketball player. Bobby Orr is a famous NHL hockey player.