As far as we know, the name in it's current form derives from the UK, predominantly in the West Midlands. It's been in the Isles long enough that there's a Scandrett Street in London. Family legend is that we're (surprise, surprise) Scotch-Irish. However, we suspect that the origin of the name may lie elsewhere, such as "Scand"inavia. But could it derive from Anglo-Saxon? Is there a philologist in the house?