Hi, I came across this list and thought I'd post. I live in the D.C. suburbs, however all of my family is from West Virginia, specifically the Elkins area.
They have a large family reunion each year that I haven't attended in about 15 years since my parents stopped making me go:-) But there has never been any question about the origin of the Wegman name, at least in our branch of the family - it is indisputably German.
I cannot at this moment recall what the exact area of Germany was that my great great great great-ish Grandfather moved here from. My grandfather's name was William Henry Wegman and He was married to Elizabeth Nevie Wegman. He would have died sometime in the 60's I suppose ( I wasn't born yet ).