Hello,I am not Jewish but my father in law Abraham was. He was born in Bratslav in Ukraine in 1896, his father
was David and hi mother Frima, my wifes name. Father David was apparently a bandsman in the Russian army.
Abie with his mother and at least one more sibling came to England in 1900, David managed get out of Ukraine and followed in 1901. The family setled in Newcastle upon Tyne and assumed the surname WELSH. Is there a likely previous surname they may have simply slightly altered. The name Velsher has been suggested (which apparently means "stranger").
I have yet to see any mention of Bratslav in your group.