Surname Sinack (Sinack 
) , worldwide, is a very rare family name. The cognomen Sinack is habitual in Netherlands, where it is a rare surname, France, where it is a very rare surname, and the United States. Likewise, Sinack is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sinack | United States, Tanzania, France, Netherlands |