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

Hi, I would love to learn more about my grandfathers heritage. I am in Toronto btw. His last name was Chmurowicz, born in Kolyma Galicia. sadly he was left at boarding school when his father's new wife rejected him. He had a brother named Karol I believe (my last name now is Carroll, his British wife suggested since it was very hard to get a job if they can't say your name, he couldn't repatriate) and also a sister. Said his mother was Hungarian and my aunt is quite olive. He wouldn't talk much, I wish I knew him better. If anyone knows about any of the boarding schools back in the 1920's or of the last name or would mean the world to me. Thanks