I was in touch with an Arkady Pogostkin in Virginia who told me his great-grandfather was Semyon Pogostkin, but he couldn't trace farther back than that and he assumed Semyon was born around 1890.I also contacted Alexander Pogostkin, violinist, a couple of years ago. Alexander told me his father was Geisha Simonovich Pogostkin--born in Zlobin, Belarus. Since Alexander was Russian, we really couldn't communicate beyond that.
Are you related to these two people?
I can only go back to Moshe Pohostkin (the "h" and "g" being interchangeable in Russian, I'm assuming they can be the same surname), born about 1840-45 to Chana Hoda Osofsky. They had 3 known children: Esther, Riva and Nachum--the children immigrated to New York; Moshe and Chana Hoda did not.
Unfortunately, I have traced all of the descendants of Moshe and none of your names appear. I do not know his parents' names or his siblings, so I don't know how we could link our lines up.
I can tell you I believe Moshe was born in or around Pohost/Pogost, and lived in Urechye and Horki--both a stone's throw from Pohost/Pogost.