Cognomen Ianai (Ianai 
, Янай 
) , in all the world, is a very rare last name. The family name Ianai is habitual in Romania, where it is a rare surname, Israel, where it is a very rare surname, and Brazil, where it is an extremely rare surname. Not in comparison with a country's population, it is commonest in Romania, Brazil, and Russia. Much less frequently, Ianai is the forename as well as the last name.