Family name Ритер (Riter 
, Rieter 
, Riether ) , around the world, is quite a rare last name. The family name Ритер is habitual in Switzerland, where it is quite a rare surname, Croatia, where it is a rare surname, and Netherlands. Measured by absolute frequency, it most frequently occurs in the United States, Germany, and Brazil. Much less frequently, Ритер is the forename as well as the last name.