I’m searching for the origin of a newly-discovered 2x great-grandfather: Frank KOSIN. He was born 4 August 1869 in “Russian-Poland” and immigrated to Nanticoke, Luzerne County, Pennsylvania around 1885 (based on his responses on US Census records). According to his PA marriage record (to his second wife), his mother was ANNA “PISHINSKI” which could be Peściński or Peszyński in Poland (I’ve heard it’s a rare surname?). A kind researcher took at look at this surname and believes this family is supposed to be from these three places: Żuromin, Bieżuń and Sierpc.
His father was THEODOR KOSIN, perhaps from the Poniatowo, Żuromin, and Sierpc area, among other nearby towns (again, based on information from a helpful poster).
My trouble is, I have been unable to find Frank Kosin in any passenger manifest I have access to. I've checked New York, Philadelphia, even Boston and Canadian ports, been very open to variant spellings of the name, searched several years before and after the 1885 date he gives.
I feel like I've exhausted every avenue: does anyone have any suggestions what to do next? Without Frank Kosin's passenger manifest, I will never know exactly where he came from; hence, here ends my search for the family. (I have not found any naturalization records for him, either).
Any advice would be most appreciated: I have hit the brick wall!
Thank you so very much,