The first of the name to come to Ireland was a Welshman, Thomas de Jorse who in 1283 married the daughter of O'Brien, Prince of Thurmond and went with her by sea to County Galway, in Iar Connach, which runs over the Mayo border. They were at first a tributary of the O'Flahertys, but established themselves so permanently in the area that it became known as Joyce's Country.
The clan had a recognized Chief of the name in the Irish way. The "Composition Book of Connacht" places the chief in the barony of Ross.
Mary (circa 1820 - ...) m. Patrick Killeen
Michael (this is according to family tradition as yet unproven)