Last name מרטנס (Mertens 
, Martens , מרטנס 
) , in all the world, is a widespread family name. The last name מרטנס is characteristic of Western Europe, particularly Belgium, where it is a common surname, Netherlands, where it is quite a common surname, and Germany (explore the name in all countries). Measured by absolute frequency, it is the most numerous in Germany, Belgium, and the United States. Very seldom, מרטנס is the forename as well as the last name.