Last name Šincek-Kusulja (Šincek-Kusulja 
) , in the world, is an extremely rare cognomen. The surname Šincek-Kusulja is habitual in Southern Europe, particularly Croatia, where it is a very rare surname. Parts of the name also exists independently as a last name Šincek, and a last name Kusulja.
| VARIANT | COUNTRY |
|---|---|
| Šincek-Kusulja | Croatia |