Check out this clever resource from barrygriffin.com which gives you maps showing the distribution of 1000s of Irish surnames across Ireland.
Admittedly, the data is pulled from the 1901 and 1911 censuses, and so is not completely up to date.
But this is still a cool resource that gives you a snapshot of where your family was most heavily based and where they had spread over the years.
Check out Irish Surname Maps Here.
Pingback: Meet Your Irish Ancestors: A Beginner's Guide to Researching Your Irish Roots - The Brehon Academy