Cognomen Kigai (Kigai 
, Кигай 
) , all around the world, is a rare last name. The last name Kigai is habitual in Kazakhstan, where it is a rare surname, Kenya, and Kyrgyzstan, where it is a very rare surname. Measured by absolute frequency, it is commonest in Kenya, Russia, and Kazakhstan. Likewise, Kigai is the forename as well as the last name.