Namesakes
Cai
(a.k.a. Kai) (m) 
Characters in Celtic Mythology
Kai Siegbahn
(m) 1918-2007
Nobel Prize Winners 1981 (physics)
Notable Scientists and Inventors
Kai Suikkanen
(m) 1960-
Olympic Medalists 1988 ice hockey (silver)
Xosha Roquemore
(middle name Kai) (f) 1984-
Notable Actors and Entertainers (actor)
Qin Kai
(m) 1986-
Olympic Medalists 2008; 2012 diving - springboard; diving - synchronized springboard (bronze/gold/silver)
Zou Kai
(m) 1988-
Olympic Medalists 2008; 2012 artistic gymnastics (bronze/gold)
Kai Verbij
(m) 1994-
Notable Athletes (skating)