Family name Мюлдер (Mulder 
, Мюлдер 
) , worldwide, is a common last name. The last name Мюлдер is habitual in Netherlands, where it is a common surname, Marshall Islands, where it is quite a common surname, and Curacao (explore the name in all countries). Not in comparison with a country's population, it is the most numerous in Netherlands, the United States, and South Africa.