Our first participant, Joe Tammany's results have come back.
It is suggested that he belongs to the Haplogroup R1b1c
Family Tree DNA says this about the Haplogroup

Haplogroup R1b1c is the most common haplogroup in European populations.
It is believed to have expanded throughout Europe as humans re-colonized
after the last glacial maximum 10-12 thousand years ago.
This lineage is also the haplogroup containing the Atlantic modal haplotype.

Many of the other surnames that come close to matching Joe are representative of the North eastern part of Ireland: Brown, Horton, McAnally, Wilson, Woods, Doherty, Harold, McNelly, McLaughlin, Caulder,
Paul, Robertson, Long, Gormley, Cowan, Jones, Davis, McCord, Heron, Kyle, Reagan
This probably comes from before the time of surnames.