Surname Humljak (Humljak 
) , in the entire world, is a very rare cognomen. The surname Humljak is characteristic of Croatia, where it is quite a rare surname, France, where it is an extremely rare surname, and Germany. Very seldom, Humljak is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Humljak | France, Germany, Croatia |