Family name Mrau (Mrau 
) , worldwide, is a rare last name. The cognomen Mrau is characteristic of Malaysia, where it is quite a rare surname, Croatia, where it is a rare surname, and Italy, where it is a very rare surname. Not in comparison with a country's population, it most frequently occurs in Malaysia, Italy, and Canada. Very seldom, Mrau is the forename as well as the last name.