Around the globe, Nielen (Nielen 
) is a rare epicene forename. The first name Nielen is characteristic of South Africa, where it is a rare primarily boy's, but very infrequently feminine name, Brazil, where it is a very rare female name, and Philippines, where it is a very rare predominantly feminine, but very infrequently boy's name. More prevalently, Nielen is the last name as well as the forename.