Cognomen Nonnsen (Nonnsen 
) , worldwide, is a very rare last name. The surname Nonnsen is characteristic of Germany, where it is a very rare surname, and the United States, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Nonnsen | Germany, United States |
| herbert nonnsen German politician (1914-1993), DE (b. 1914) |
|