Cognomen Hillyer-Timmerman (Hillyer-Timmerman 
) , around the globe, is an extremely rare surname. The cognomen Hillyer-Timmerman is characteristic of Northern America, particularly the United States, where it is an extremely rare surname. Parts of the name also exists independently as a last name Hillyer, and a last name Timmerman.
| VARIANT | COUNTRY |
|---|---|
| Hillyer-Timmerman | United States |