Last name كاثر (Kather 
, Cather 
, كاثر 
) , across the world, is quite a rare surname. The last name كاثر is characteristic of Germany, where it is quite a rare surname, Qatar, and Kuwait. In absolute terms, it is commonest in Germany, the United States, and India. Much less frequently, كاثر is the forename as well as the last name.