Rai \rai\ as a boy's name is pronounced RYE-ee. It is of Japanese origin, and the meaning of Rai is "trust; lightning, thunder". Also a Spanish short form of Raimundo.
For more information, see also the related name Ray.
Baby names that sound like Rai are Raj, Rae, Rei and Roi. Other similar baby names are Cai, Hai, Dai, Ras, Jai, Kai, Rabi, Rad, Rafi, Rain, Ram, Rami, Ravi and Rab.