Irish derivation: Ó Breathnach

Name meaning: "Breton," "Welshman," or "Foreigner"

Counties associated with the name: Cork, Dublin, Kerry, Kilkenny, Limerick, Mayo, Offaly, Sligo, Tipperary, 

Coat of arms motto: Transfixed, but not dead.

Interesting Facts:

 - Fourth most common surname in Ireland

 - The French government distinguished an Irish immigrant Walsh family in the 1700s for their efforts in the French army.

 - The name was used in particular to denote the Welshmen who arrived in Ireland in the wake of Strongbow’s Anglo-Norman invasion of 1170.

Famous Walshes/Branaghs:

 - Kenneth Branagh (1960-, Northern Irish actor) ;

 - John Walsh (1945-, host of "America's Most Wanted")

 - Maria Elena Walsh (1930-2011, Argentine singer and writer)

 - Kate Walsh (1967-, American actress)

 - Kimberly Walsh (1981-, British singer) 

 - Norman Walsh (1932-2010, Rhodesian/Zimbabwean air marshal) 

All about the Walsh clan.