Family name Seilen (Seilen 
) , in the world, is a rare cognomen. The family name Seilen is habitual in Norway, where it is quite a rare surname, Honduras, where it is a very rare surname, and Venezuela, where it is an extremely rare surname. Measured by absolute frequency, it is the most numerous in Norway, India, and Venezuela. Likewise, Seilen is the forename as well as the last name.