Family name Devjak (Devjak 
) , in the entire world, is a rare cognomen. The last name Devjak is characteristic of Southern Europe, particularly Slovenia, where it is quite a rare surname, North Macedonia, where it is a rare surname, and Croatia. In absolute terms, it is the most numerous in Slovenia, Croatia, and Australia.
| VARIANT | COUNTRY |
|---|---|
| Devjak | Slovenia, Australia, Croatia, Italy, North Macedonia |
| srečko devjak SI (b. 1947) |
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| srečko devjak Ph.D. University of Ljubljana 1987 |
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| rok devjak researcher |
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| srečko devjak SI (b. 1976) |
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| leon devjak SI |
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| tatjana devjak SI |
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| rok devjak SI |
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