Surname Deac (Deac 
, Deák 
, Дяк 
) , around the globe, is a common cognomen. The last name Deac is characteristic of Romania, where it is quite a common surname, Aland Islands, and Hungary. Not in comparison with a country's population, this name is the most popular in Romania, Hungary, and Jordan. Much less frequently, Deac is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Deac | Italy, United States, Germany, Romania, Spain |
| Deák | Hungary, Slovakia, Serbia, Romania, Spain |
| Дяк | Russia, Kazakhstan |
| دياك | Jordan, Palestinian Territory |
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augustin deac Romanian lawyer, RO (b. 1879) |
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nicolae grigore deac RO (b. 1891) |
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| dănilă deac RO (b. 1856) |
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| eftimiu deac Romanian economist, RO (b. 1874) |
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augustin deac Romanian writer and historian (1928-2004), RO (b. 1928) |
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| augustin s. deac RO (b. 1883) |
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| gavril deac RO (b. 1884) |
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| iuliu deac (b. 1904) |
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| mircea deac Romanian artist, RO (b. 1921) |
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ciprian deac Romanian association football player, RO (b. 1986) |
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bogdan-daniel deac Romanian chess player, RO |
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| ioan deac Romanian politician from Bogdan Vodă, Maramureș County, RO |
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| wilfred p. deac American military writer, US |
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| mariana deac RO (b. 1970) |
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| mircea-aurel deac Romanian politician from Cernești, Maramureș County, RO |
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