Last name Willhelmi (Willhelmi 
) , in all the world, is an extremely rare family name. The last name Willhelmi is characteristic of Germany, where it is an extremely rare surname, and the United States. Also, Willhelmi is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Willhelmi | Germany, Spain, United States |
| otto willhelmi (b. 1831) |
|