Cognomen Zär (Serre 
, Zär 
) , in the entire world, is a common last name. The family name Zär is characteristic of France, where it is quite a common surname, Belgium, where it is quite a rare surname, and Canada, where it is a rare surname. In absolute terms, it is the most numerous in France, Canada, and the United States. Much less frequently, Zär is the forename as well as the last name.