Genealogy / Searching for Jurczynski [10]

Any help would be much appreciated!

I am looking for some biological family members. I don't have much information besides the family name is Jurczynski. I am mainly looking for Pawel Jurczynski. They lived in Srem in the 1980's. Unsure if they are still there now. The family had a jewelry business.

I have tried searching online but have had no real luck. Where would be the best place to begin?

This is the only information I could find about my great grandfather:

JURCZYŃSKI Stefan (1901 -1985); kupiec, powstaniec wielkopolski, uczestnik ruchu

oporu w l. 1939-1945