Surname Grevain (Gravis 
, Grevain ) , in the entire world, is a rare last name. The surname Grevain is characteristic of Latvia, where it is quite a rare surname, Israel, where it is a rare surname, and Belgium. Measured by absolute frequency, this name is the most popular in the United States, France, and Latvia. Likewise, Grevain is the forename as well as the last name.