The family name Whelan is an anglicisation of the Irish surname Ó Faoláin. The surname originates from the Middle Irish (plural Uí Faeláin) the name of the 10th to 11th century ruling dynasty of the Déisi, a population group inhabiting the area of the modern county of Waterford and County Kilkenny in the early medieval period. The word is derived from the Old Irish word faelán meaning a young (small) wolf; -án being of the diminutive suffix in Irish. Ó (anglicised as O') derives from the Old Irish úa, meaning "grandson", or more figuratively "patrilineal descendant". The patronym that follows is always in the genitive case, in accordance with Irish grammatical rules, and is normally marked by an "i" following the final vowel. Therefore, the name Faelán, becomes Úa Faeláin as a patronym in Middle Irish, from which is derived Ó Faoláin in Modern Irish, of which in turn Whelan, Phelan, O'Phelan etc. are anglicisations. According to the legendary history of Ireland, about 300 A.D., the Déisi settled on the site of Dungarvan, County Waterford. In the 12th and 13th centuries, during the early Anglo-Norman period, records of a political nature relating to the Déisi and the descendants of the Uí Faeláin dynastic group decline. The Faelán referred to is Faelán mac Cormac, who is recorded in the Annals of Inishfallen as having succeeded his father as king of the Déisi in 966. The first person referred to as úa Faeláin is his grandson Mothla mac Domnall, or Mothla úa Faeláin, who was king of the Déisi until his death at the Battle of Clontarf in 1014, and whose head is recorded in the Annals of Ulster as having been interred with Brian Ború in Armagh. During this period however, Irish patronyms had not yet petrified into surnames proper. According to the Annals of the Four Masters: The Age of Christ, 1170. M1170.11 Robert Fitz Stephen and Richard, son of Gilbert, i.e. Earl Strongbow, came from England into Ireland with a numerous force, and many knights and archers, in the army of Mac Murchadha [Dermot MacMurrough], to contest Leinster for him, and to disturb the Irish of Ireland in general; and Mac Murchadha gave his daughter to the Earl Strongbow for coming into his army. They took Loch Garman [Wexford town; a stone walled Norse settlement], and entered Port-Lairge [Waterford town; a Norse settlement] by force; and they took Gillemaire,