Surname Эрхардт (Erhardt 
, Ehrhardt , Эрхардт) , globally, is a common family name. The family name Эрхардт is characteristic of Marshall Islands, where it is a common surname, Germany, where it is quite a common surname, and Austria, where it is quite a rare surname. Not in comparison with a country's population, it is commonest in Germany, the United States, and France. Very seldom, Эрхардт is the forename as well as the last name.