Last name Изаи (Izay 
, Изаи 
, Ysaÿe 
) , all around the world, is a rare cognomen. The cognomen Изаи is characteristic of Austria, where it is a rare surname, Hungary, and Belgium. Not in comparison with a country's population, it is commonest in Austria, Indonesia, and Hungary. Likewise, Изаи is the forename as well as the last name.