Hi Bruce
I don't know if this means anything, but my grandfather's name was Vlah, pronounced Vlak, he moved to Italy where they changed the spelling to Vlach, as to make the hard k sound they use ch.
He had a brother called Frank, who moved to Clevland, Ohio who kept the original spelling of Vlah. I am trying to find more info on this, as my mother's maiden name is Vlach.
Hope this is useful.
Rossana