Actually I am an administrator of the Cyr/Sears project: so thats how this information came to my attention......so no I havent done any further work on Keane DNA......to type it the various Irish sub specialty groups.......
Suffice it to say: Sears isnt an Irish name in general: but there was a group of Seer O Sullivans:......aka the Builders........where Seer is not Irish but the Latin into Celt word for "maker" of..as in the European Sire and Sueur
(and no: not the title Sire)
In the Irish case it was structures........masons, shipbuilders, etc
These Seers were only known to live in and around Tuoist in that very south eastern peninsula......presumably of O Sullivan affiliation with that branch that settled there originally from County Kerry and nearby..
That southern eastern corner is most associated with Southern Irish Type 2......
We do know marriage and change of clan affiliations in battle did precipitate change in last names at times...... so I guess we should not be surprised that Keane shares nearly identical tribal DNA profiles with several other Irish names coming from the same geography.
I think with these matches: one can safely rule out northern Irish roots however.