Cognomen アイセイ (Isay 
, アイセイ) , in the entire world, is quite a rare last name. The surname アイセイ is habitual in Ethiopia, where it is quite a rare surname, Israel, where it is a rare surname, and Mexico. In absolute terms, it is commonest in Ethiopia, Mexico, and Indonesia. Likewise, アイセイ is the forename as well as the last name.