Cognomen Ivsak (Ivsak 
) , in the entire world, is a very rare surname. The surname Ivsak is habitual in Croatia, where it is a very rare surname, Canada, and Germany, where it is an extremely rare surname. Not in comparison with a country's population, it most frequently occurs in Canada, Germany, and France.
| VARIANT | COUNTRY |
|---|---|
| Ivsak | Germany, Croatia, United States, Canada, France |