My Wolinsky ancestors from area between Mir and Minsk in Belarus Russia. They spelled their names in a wide variety of ways over the years including also Vilonskii, Wilensky, Vilensky, and Wilinsky. My great grandfather's name was Benjamin Berl (Dov in Hebrew) and he was reported in various documents such as birth certificates as Berl, Berke, Benjamin, Benny, and Barney and in Ancerstry.com even a Borney. I have a few theories some of which are mutually consistent:
1/ Hebrew and Yiddish are often written without vowels and there are no vowels so VLNSKY could be written in different ways.
2/ A government clerk who speaks a different language asks for a name and then misspells it a bit. There can be a double error when a geneology site tries to transcribe handwriting.
3/ In the case of Berl Wolinsky and his brothers maybe they were trying to confuse central government official trying to draft young men for the Russian army.