Namesakes
Arthurian Characters:
1 character
Sir Yvain (a.k.a. Owain) (m) 
Notable Actors and Entertainers:
2 actors
Rhys Ifans (a.k.a. Owain) 1967-
Owain Yeoman 1978-
Notable Athletes:
1 soccer
(soccer) Owain Fôn Williams 1987-
Other Royalty:
1 prince
Owain Glyndŵr 1400-c. 1415 Wales
Shakespearian Characters:
1 character
Owen Glendower (a.k.a. Owain) Henry IV (1)