John O'Hart gives Coffey of Munster as the ancestral line for the Isle of Skye Nicolsons.
Recent DNA testing of one Nicholson (FTDNA 224032 67 Markers) has close O'Shea connections which do not show up with another Nicholson (FTDNA #230107, 111 markers, L513+) who is a 4 step match to #224032.
Unfortunately O'Hart, 1892, does not give an ancient ancestral lineage for the O'Shea trees, and at present I have found no other genealogical sources (accessed from the Corca Laidhe home page) which gives a link between these three families.
#230107 is willing to do another SNP test if this would help to confirm Irish rather than Scandinavian origins for the Skye Nicolsons - any suggestions from more experienced researchers?
Nicolsons were known as MacNeacail/MacNicol prior to the late 1600s and they are recorded in the MS1467 genealogical collection of Scottish clans from John (written as eoin) s/o eoghain, and going back to Harald or araillt.
This Harold is shown on the O'Hart tree, p.281, as 92 Ard, s/o 91 Nicholl, brother of Teige, s/o 90 Cobtach (3), s/o 89 Walter in the Coffey of Munster, p280.
Thanks in anticipation
Fiona in NZ