Well, that's kinda fascinating, Ken! Where did this show up? You have me very curious now.
Our surname yDNA subproject began almost 18 years ago...albeit at a snail's pace at first. It now incorporates other surnames--not as the result of NPEs but of time: we share a common patrilineal ancestor somewhere in the past, but it's before surnames were commonly adopted in the British Isles, probably circa 700-900 AD--and has positively identified multiple branches of our specific Williams line.
Unfortunately, we have never been able to link those branches to original immigrant(s). Our working hypothesis is that we came over to the Delaware valley during the wave of Welsh Quaker migrations prior to 1730, and then left Pennsylvania following the influx of Scotch-Irish to move through Virginia and on into north-central North Carolina where many Friends settled in the late 1700s and early 1800s. This is in need of updating to bring it current, but it's a biiig JPEG chart that will give you a snapshot of our lines, anonymized for test-taker's names.
Drop me a private message from my profile if you want to chat further without clogging up your G2G topic.