Family name Iasu (Iasu 
) , all over the world, is a very rare surname. The surname Iasu is characteristic of Israel, where it is a rare surname, Norway, where it is a very rare surname, and Italy, where it is an extremely rare surname. Measured by absolute frequency, it is the most numerous in Israel, Italy, and the United States. Also, Iasu is the forename as well as the last name.