Namesakes
Characters in Celtic Mythology:
1 character
Cai (a.k.a. Kei) (m) 
Notable Athletes:
1 tennis
(tennis) Kei Nishikori 1989-
Olympic Medalists:
2 bronze
(bronze) Kei Nishikori 2016 tennis
(bronze) Kei Marumo 2016 synchronized swimming - team