Last name יאנוס (Janus 
, יאנוס 
) , all over the world, is a common family name. The surname יאנוס is characteristic of Poland, where it is quite a common surname, Croatia, where it is quite a rare surname, and Slovakia. In absolute terms, it most frequently occurs in Poland, the United States, and Germany. Likewise, יאנוס is the forename as well as the last name.