Costello is a surname. It is often found among people of Irish origin, though other ethnic backgrounds may possess it (like some Italian-Americans). History The Irish surnames Costello, Costelloe, and Costellow are anglicized forms of the Gaelic surname Mac Oisdealbhaigh, itself a Gaelicized form of an Anglo-Norman name. This was the first example of a Norman family assuming a Gaelic name. This surname has been mainly borne by a notable Irish family who claimed descent from Jocelyn de Angulo, an Anglo-Norman mercenary who accompanied Richard de Clare to Ireland in 1170 during the Anglo-Norman invasion of Ireland. An early record of the name in Ireland appears in the 17th century Annals of the Four Masters where the name is mentioned in the entry for the year in 1193: Inis Clothrann do orgain la macaibh Oisdealb, & la macaibh Conchobhair Maonmaighe. (Inishcloghbran was plundered by the sons of Oisdealb, and the sons of Conor Moinmoy.) The descendants of Oisdealb then became referred to by the family name Mac Oisdealbhaigh (son of Oisdealb). Costello has also occasionally has been adopted as a pseudonym or stage name by famous people of Italian descent, including Al Costello (né Giacomo Costa), Frank Costello (né Francesco Castiglia) and Lou Costello (né Louis Francis Cristillo). People Al Costello (1919–2000), the ring name of Italian-Australian professional wrestler Giacomo Costa Anthony Costello (born 1953), British paediatrician and professor Anthony J. Costello, Australian urologist Ashley Costello, Lead vocalist for New Years Day Barry M. Costello (born 1951), United States Navy Vice Admiral Billy Costello (boxer) (1956–2011), American boxer Cormac Costello (born 1994), Gaelic football player Carol Costello (born 1961), American news reporter Daniel Rae Costello (born 1961), Pacific musician Declan Costello (1926–2011) Irish High Court Judge Desmond Patrick Costello (1912-1964), linguist, soldier, diplomat and academic Diosa Costello (1913–2013), American actress Dolores Costello (1903–1979), American film actress Dubhaltach Caoch Mac Coisdealbhaigh (died 1667), Irish soldier and rapparee Edward Costello (1887–1916), Irish Citizen Army volunteer who died during the Easter Rising Elvis Costello (born 1954), English singer and musician, born Declan Patrick MacManus Frank Costello (1891–1973), American criminal and mobster (born in Italy as Francesco Castiglia; took the Costello name in the 1920s) Frank Costello (footballer) (1884–1914), English footballer who played for Southampton and West Ham United Helene Costello (1906–1957), American film actress Herman T. Costello (1920–2017), American politician Jensine Costello, (born 1886), Norwegian painter Jerry Costello (born 1949), American politician Joe