Last name Hashman (Hashman 
, Haschmann 
) , in the entire world, is a rare surname. The last name Hashman is characteristic of the United States, where it is a rare surname, Australia, where it is a very rare surname, and New Zealand. Not in comparison with a country's population, the name is most common in the United States, Germany, and Pakistan. Much less frequently, Hashman is the forename as well as the last name.