Family name Proschak (Proschak 
) , in the entire world, is a very rare last name. The cognomen Proschak is habitual in Germany, where it is a very rare surname, and the United Kingdom, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Proschak | United Kingdom, Germany |
| ewgenij proschak researcher (ORCID 0000-0003-1961-1859) |
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| ewgenij proschak researcher |
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| astrid proschak |
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