Worldwide, Dellen (Dellen 
) is a rare gender-neutral forename. The first name Dellen is habitual in Indonesia, where it is a very rare boy's name, South Africa, where it is a very rare unisex name, and the United States, where it is an extremely rare gender-neutral name. More frequently, Dellen is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Dellen | United States, Austria, Germany, Indonesia, Netherlands |
| fons dellen NL (b. 1958) |
|