Surname Kotrulja (Kotrulja 
) , in the world, is a very rare cognomen. The last name Kotrulja is habitual in Croatia, where it is a rare surname, and the United States, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Kotrulja | United States, Croatia |
| luka kotrulja Croatian basketball player, HR (b. 1998) |
|