HELP ME ABOUT MY SURNAME: KOPERNICKI / KOPERNICKY

I am live in Bosnia, my great - great father came form cezhoslovakia (than it was Austo-Hungarian empire) but in my family stories we came to cezh from Poland in 19th centy. Searching on internet my surname i was shocked because you can find it in almost every country in eastern Europe (Poland, Cezh, Slovakia, Ukraine, Belarus, Russia, Hungary, Romania). My ancestors belong to catholic church, but there is also family story that we are converted Yews from Poland.

HELP ME WITH TWO THINGS IS THIS A POLISH OR YEWISH SURNAME, AND IF IT IS NEITHER THAN THOSE TWO FROM WHER DO YOU THINKS THIS SURNAME IS?

maybe this can halp in the church birthcard my grandfather surname is spelled KOPERNICKY

@MAJMONID

Your questions cannot be answered on the basis of the information you have provided, which is just the surname. It could be Polish, or it could be something else. You need solid documentation in the form of official documents. Without that, all you can do is make wild guesses.

@DominicB
Maybe this can help a litle. my grandfather tels me that our direct ancestor is a linguist IZYDOR KOPERNCKY from Poland

Izydor was a physician and professor. It was his brother Walerian who was the linguist. Here is Izydor's article from Polish Wikipedia:

pl.wikipedia.org/wiki/Izydor_Kopernicki