I may have a trip to Ireland for a deposition this summer. So, I did a little surfing for interesting Irish sites. This one seemed pretty useful -Welcome to Clans of Ireland - Discover your Irish Heritage! * Likewise, as interested as I am in the Irish origin of the Bradley name - borne proudly by all the famous members of the Bradley Clan, such as Tom, Omar and Ed, none of whom were visibly Irish - I located this site on Bradley Surname History which had this useful information:

Some Bradleys in Ireland are of English descent, but in Ulster, again along the Derry-Donegal-Tyrone border, there are many who are descended from the Irish sept O’Brollachain. The O’Brollachain name was anglicised as O’Brollaghan and more commonly, as Bradley. The name is widespread in parts of central and south Derry, around Garvagh, Swatragh, Maghera, Draperstown and Desertmartin.

Usually, this kind of information is pandering nonsense aimed at people looking for their roots. On the other hand, my sainted grandmother, a Slevin by birth, told me many years ago that the Bradleys had decamped from Londonderry back in the latter part of the Nineteenth Century.