Genealogy / THE MEANING AND RESEARCH OF MY POLISH LAST NAME, SURNAME? [4500]

Hello, I have tried a few dictionaries to find a specific meaning of the root Kant or Kantr in my last name (Kantrowski) so I can come up with a specific meaning and received varied answers. Does anyone know of a common or specific meaning when used as a last name?

Genealogy / THE MEANING AND RESEARCH OF MY POLISH LAST NAME, SURNAME? [4500]

Thanks! I bet that's it. I've seen that spelling more than my own when searching. I came across one dictionary that said kant meant edge or bezel but other dictionaries seemed to say that wasn't accurate.

My mother's maiden name of Kopczynski has been giving me trouble as well. If I'm not imposing would you be able to help with this one as well?