I am trying to track my grate-grand father's real surname. He was born 17 Mar 1895 in Bialystok, Grodno, Poland/Russia. He immigrated to the US. (Chicago) and officially changed his name according to his naturalization papers from GARASIMSHUK to GARIS. I have been unable to find any information of his real surname in Poland. This has lead me to believe that perhaps there is another spelling. If you can help, please contact me.