Surname Hajdinjak (Hajdinjak 
) , worldwide, is quite a rare last name. The cognomen Hajdinjak is habitual in Slovenia, where it is quite a common surname, Croatia, and Romania, where it is quite a rare surname.
| VARIANT | COUNTRY |
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| Hajdinjak | Romania, Austria, Germany, Slovenia, Croatia |
| andrija hajdinjak (b. 1847) |
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| mateja hajdinjak researcher |
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| tine hajdinjak researcher, SI |
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| melita hajdinjak Ph.D. University of Ljubljana 2012 |
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| valentin hajdinjak SI (b. 1973) |
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| emina hajdinjak SI |
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| melita hajdinjak SI |
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| dušanka hajdinjak SI |
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| blaž hajdinjak SI |
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| pavao hajdinjak SI |
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Mr, Jaka, Jure, Tina, Tine, Nada, Nina, Vera, Ivan, Mario, Marko, Matej, Matea, Mojca, Milan, Mirko, Mitja, Sanja, Saša, Silvo, Sonja, Antun, Jana, Luka, Lara, Dino, Ms, Ana, Leo, Lea, Jan, Edo, Eva, Iva, Mato, Maja, Anita, Miro, Sasa, Saso, Sven, Anda, Anna, Anja, Ajda, Kata, Paul, Rene, Sara, and Anica