I found an article in the 1922 St Louis Post Dispatch that referenced Alex Sigoloff (son of Eli, who is son of Menachem) receiving a letter from his family still in Russia at that time. (See Alex's profile, media, I've uploaded the article there.)
He referenced the town "Tarsha". An article on JewUA (http://jewua.org/tarashcha/) pointed me to these Tarsha censuses, and am led to believe that the surname Sigolov is contained in them. They're scanned originals and appear to be in Ukranian.
Hello, my name is Yuri Ermolaev. I am russian historian genealogist. I think that I can help you - if you plan to look for any documents in russian archives.
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