Surname Yshak (Yshak 
, Ишак 
) , throughout the world, is a rare last name. The surname Yshak is habitual in Ethiopia, where it is a rare surname, Russia, where it is an extremely rare surname, and Venezuela. Not in comparison with a country's population, it is the most numerous in Ethiopia, Russia, and Mexico. Also, Yshak is the forename as well as the last name.