Cognomen Potasch (Potasio 
, Potasse 
, Potasch 
) , all over the world, is a rare family name. The family name Potasch is characteristic of Slovakia, where it is quite a rare surname, Netherlands, where it is a rare surname, and Hungary, where it is a very rare surname. In absolute terms, it is commonest in Slovakia, Brazil, and Netherlands. Much less frequently, Potasch is the forename as well as the last name.