Surname Protsak (Protsak 
, Процак 
, Протсак ) , all over the world, is quite a rare cognomen. The surname Protsak is characteristic of Ukraine, where it is quite a rare surname, Russia, where it is a rare surname, and Kazakhstan.
| VARIANT | COUNTRY |
|---|---|
| Protsak | Spain, France, United States, Russia, Ukraine |
| Процак | Russia, Kazakhstan, Ukraine |
| Протсак | Russia |
| valentyn protsak researcher |
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| ludmila vasilievna protsak Ph.D. Institute of Mathematics of National Academy of Sciences of Ukraine 1996 |
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| l. b. protsak Ph.D. Kiev State University 1996 |
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| victor protsak Ph.D. Yale University 2000 |
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| iryna protsak researcher (ORCID 0000-0002-2817-2192) |
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| egor s protsak researcher (ORCID 0000-0002-9217-9890) |
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