Costello

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Costello
Gender Unisex
Language(s) English
Origin
Language(s) Irish
Word/Name Mac Oisdealbhaigh
Meaning "son of Oisdealbhach"
Other names
Cognate(s) Mac Oisdealbh
See also Mac Coisteala

Costello is a surname in the English language.

The surname has been borne by a notable Irish family who claimed descent from Jocelyn de Angulo (fl. 1172), an Anglo-Norman knight. The family first appears on record in Ireland in 1193, when the Annals of the Four Masters state: Inis Clothrann do orgain la macaibh Oisdealb, & la macaibh Conchobhair Maonmaighe. Inishcloghbran was plundered by the sons of Osdealv, and the sons of Conor Moinmoy. [1]

Oistealb or Osdealv was the Gaelic rendering of Jocelyn [2]; the sons of Joycelyn were Philip, Gilbert, and William de Angulo. The descendants of William de Angulo/Mac Costello settled in Connacht and became Gaelicized, dropping the surname de Angulo in favor of Mac Oisdealb, or Mac Costello [3]. The barony of Costello in east Mayo is named from this family.

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