"Blagg (birth name)" ??

Judging by "her" ancestral research, had your ancestors come through Ellis Island around 1900 that might well have appeared as "Black" on the ship manifests and/or the immigration rolls.

You could be Mannin Black (and go by "Mannie" in the evenings).

Of course with about equal likelihood it might have become "Blaugh," but then you'd have to be "E. Ringo."

If any of your ancestors migrated - almost anywhere - you might find something with a "family ring" to it more to your liking in your family tree, but genealogical research can be rather time consuming if you don't already have a fair start on it. You might, though, try searching your existing original and/or current names at a couple of the genealogical web sites to see if their were near relatives of someone with names like yours with better names - if there's a possibility that you might someday want some "descendants of your ancient ancestors" to stumble in on you. Your granpa's sister might have married into a better_named family.(?)

John