Family name Sylven (Sylven 
, סילבן 
) , globally, is a rare last name. The last name Sylven is habitual in Sweden, where it is quite a rare surname, Finland, where it is a rare surname, and Switzerland, where it is a very rare surname. Measured by absolute frequency, it is the most numerous in Sweden, the United States, and Finland. Also, Sylven is the forename as well as the last name.