Surname จำเป็น (Champen 
, Jampen 
, Jumpen ) , all over the world, is a rare family name. The family name จำเป็น is habitual in Switzerland, where it is quite a rare surname, Indonesia, where it is a very rare surname, and Canada. Measured by absolute frequency, it is the most numerous in Switzerland, the United States, and Indonesia. Likewise, จำเป็น is the forename as well as the last name.