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
Gillespie (surname) Gillespie (surname) Gillespie () is both a masculine given name, and a surname in the English language. The given name is an Anglicised form of the Gaelic "Gille Easbaig" (also rendered "Gilleasbaig"), meaning "bishop's servant". The surname "Gillespie" is an Anglicised form of the Scottish Gaelic "Mac Gille Easbuig", and the Irish "Mac Giolla Easpaig", both of which mean "servant of the bishop". The given name itself is derived from a word of Latin origin. Specifically, the Old Irish "epscop" being derived from the Latin "episcopus". An early example of the name in Scotland occurs in a charter dated 1175–1199,