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