Below is a "Heat Map" form the Genographic Project showing the route my ancestors took to Ireland - very strong Celtic connection. Since I know of no non-Irish people in O'Loughlin and Byrne ancestors, this is no surprise. The map is based on my paternal line, which is more accurate than the maternal line for everybody:
From the report:
The map of M222 shows a distribution that peaks in Ireland, where it experienced successful expansions as a result of founder effects. This haplogroup has been linked to Niall of the Nine Hostages, one of the kings who united tribes in northern Ireland during the 5th century AD and may have had a large genetic impact on the region. The frequency drops to across the rest of the British Isles and southern Scandinavia.
My maternal line "Heat Map" is as follows:
Basically - we are all related through our mothers!