Cognomen Yitzchak (יצחק 
, Yitzchak 
, إسحق 
) , in the world, is a common last name. The surname Yitzchak is characteristic of Israel, where it is a common surname, Sudan, where it is quite a rare surname, and Libya, where it is a rare surname. In absolute terms, it is the most numerous in Israel, Sudan, and Egypt. Likewise, Yitzchak is the forename as well as the last name.