Surname Dejak (Dejak 
, Деяк 
) , in the entire world, is quite a rare family name. The cognomen Dejak is habitual in Slovenia, where it is quite a rare surname, Ukraine, and Croatia. Measured by absolute frequency, it is commonest in Ukraine, Slovenia, and Russia. Much less frequently, Dejak is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Dejak | United States, Slovenia, Poland, India, Croatia |
| Деяк | Russia, Belarus, Ukraine, Kazakhstan |
| henrik dejak SI (b. 1840) |
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| camillo dejak author (20th century) (b. 1901) |
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| france dejak Survivor of the Kocevski Rog killings, SI (b. 1925) |
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| michal dejak UA (b. 1922) |
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ernesta dejak furlan SI |
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| beata dejak researcher, PL (b. 1964) |
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| lijana dejak SI (b. 1960) |
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| janez dejak SI (b. 1973) |
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| michael dejak |
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| vlasta dejak SI |
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| adèle dejak GB |
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