There are surnames with -uk ending in certain regions of Poland and Ukraine (and Belarus as well). I would be careful with assuming that the surname ends with -yk, since it’s written with “u”. 

I never heard about the surname “Tworczuk” though, I heard about “Sworczuk” instead and I know people with that surname.

Your example suggests the surname “Tworyczuk”, but I don’t know that neither.

The surnames with that ending are typical for Eastern Poland and Western Ukraine. Not sure if it’s common in Belarus, but I saw some people with surnames with this ending.


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