I researched my Irish Gaelic Surmame…

Using the site Gusman found..

1,478,479th
Most Common
surname in the World
Approximately 143 people bear this surname

MOST PREVALENT IN:
Wales
HIGHEST DENSITY IN:
Wales

I would have thought it would be most common in Eire but apparently not.
But there are many variations from the original root.

Two folk on here know what it is.