Last name Fusty (Fust 
, Fusty 
) , all around the world, is quite a rare surname. The cognomen Fusty is habitual in Switzerland, where it is quite a common surname, Germany, where it is quite a rare surname, and Hungary, where it is a rare surname. Measured by absolute frequency, it is the most numerous in Germany, Switzerland, and the United States. Much less frequently, Fusty is the forename as well as the last name.