Rei \rei\ as a boy's name (also used as girl's name Rei), is pronounced RAY-ee. It is of Japanese origin, and the meaning of Rei is "law, rule; strive". Reizo (ray-ee-ZOH) means "cool, calm; well-groomed".

Rei has 1 variant form: Reizo.

Baby names that sound like Rei are Rai, Rey, Reo and Roi.