There are several Walsh families in Ireland who have recognized coats of arms. These are the Walshs of Ballykilcaven, in County Laois, whose motto is "Firm" and their crest is a griffin's head.
Irish derivation: Ó Murchadha. Name meaning: "Descendant of the sea warrior." Counties associated with the name: Cork, Wexford, Roscommon, and Tyrone. Coat of arms motto: Brave and hospitable.