Costello (surname) to a Gaelic translation of Jocelyn, Jocelyn d'Angulo's given name. In fact, MacOisdealbhaigh is the Gaelic translation of his brother Hostilo (or Hostilio) d'Angulo's first name. Oisdealbh is a much more obvious translation of Hostilo. It is Hostilo's descendants who would bear the surname Mac Oisdealbhaigh (son of Oisdealbh or Hostilo). The surname would later be anglicized to Costello, Costelloe, and Costellow. Gilbert d'Angulo is also sometimes listed as the son of Jocelyn d'Angulo in error. Gilbert d'Angulo is the father of both Jocelyn and Hostilo. It occasionally has been adopted as a pseudonym or stage name by famous people
Moran (surname) in north Mayo, surrounding the modern town of Ballina. Following the Norman invasion, their territory was usurped by the Barretts and Burkes and the sept lost its central organisation. The modern distribution of the surname within Mayo suggests that the Morans spread southwards and today are chiefly found in the central area of the county, particularly in the barony of Carra. Moran (surname) Moran () is a modern Irish surname and derived from membership of a medieval dynastic sept. The name means a descendent of "Mórán". “Mor” in Gaelic translates as big or great and “an” as the prefix the.