Language / HEE-nuff-Skee? American trying to find the correct pronunciation of his Polish last name. [9]

Hi, I'm a 3rd or 4th Polish-American from Chicago IL. Although my city has one of the largest Polish populations outside of Poland itself I don't really know anyone who speaks fluent Polish seeing as though most of my friends are like myself (Polish-American) therefore limiting our Polish to mostly swear words and the term "Na zdrowie" when were getting **** faced. My last name is Hejnowski. So far I have had people who claim to be supposed fluent Polish speakers tell me that my name is pronounced HEE-nuff-Skee, Haj-nuff-skee, etc. I was just wondering if anyone on here knew of the correct pronunciation? Thanks.