Hi Clive
Many theories abound on the Dance/Dancy origins - I know for sure (via my and my Irish cousin Dancey autosomnal DNA matches) that most of the " Canadian" Dancy/Danceys emigrated to there from Ireland. But some Canadian Danceys emigrated from England too. These Irish Danceys probably/ possibly emigrated from England in the early 1600's as part of the James 1 plantation of the kingdom of Ulster. And I and my "Irish" Dancey cousins also have DNA matcehs to descendants of the very early Dancey colonial settlers in Virginia and North Carolina ([possibly direct from England but maybe in the early 1700's direct from Ireland).
I'm not sure I follow your comment that you've not yet made any connections from your Dancey group to any other Dancey community other than descendants, since I'm not sure, given the lack of records there are, how one might otherwise proceed as a starting point, other than descendants and DNA. I know you have done a Y DNA test, but I'm not sure if you've taken an autosomanl one.
I have found, and would be happy to share the information, late 1600 parish records for Doddington Kent, relating to Dancey marriages and baptisms and which appear to be the documentary evidence/explanation for several of my DNA matches. And 2 of my Irish Dancey cousins have several DNA matches to people who appear to descend from Danceys from the Stroud/Uley/Tormarton area of Gloucestershire.
Would you be able to do an autosomnal test if you haven't already, and share/pool whatever comes from that so we could make a start on trying to find the documentary trail as well? Otherwise I guess we just go on wondering about possible connections.
all the best
Roz