Well if you don't know something , ask Google ! :))
Surnames ending witch -wicz come from Tatars or Armenian. For exemple Abakanowicz, Achmetowicz, Assanowicz, Chazbijewicz (Tatars) and Agopsowicz, Awedykowicz, Isakowicz, Isakiewicz, Manugiewicz, Sarkisiewicz, Torosiewicz, Torosowicz (Armenia)
Surnames ending with -uk come from Ukraine
With -ski, -dzki, -cki endings come from Polish szlachta
With -ow, -ew ending are Russian names.
With -us or -is ending are Lithuania names.
There is a problem with Jewish surnames because until XVIII century, Jews in Poland had no surnames. They lived usually in small communities and named themselves for example as Abraham ibn Tobia (Abraham son of Tobia). In XVIII in Malopolska, which was on Austrian occupation, Jews was made to "named" themselves. And so you can have one of those surnames above and have Jewish ancestors. But generally many of Jewish surnames ending with -berg, -man, -wach, -baum
Surnames such as Uryga (latin:Auriga, eng. waggoner ), Kowal (smith) come from name of profession.
I was always told that (Son of ) ended with a czyk.
That's true, but who have surname like Kowalczyk, could be son of smith or... his adjunct. :)