Costello

• Costilow, Costley, Costlow

• As an Irish surname, reduced Anglicized form of Irish Mac Oisdealbhaigh (“son of Oisdealbhach”), a personal name composed of the elements os (“deer”) and dealbhach (“resembling, in the form of”).
• As an Italian surname, Americanized from Castello.
• As a Serbo-Croatian or Slovene surname, Americanized from Kostelec, Kostevc, from Kostelsko region in Lower Carniola, named after Kostel Castle, from earlier Costel, Slavicized from Latin castrum (“fortress”), hence related to the Italian above.

• (US) IPA^(key): /kɑˈstɛloʊ/
• (Ireland) IPA^(key): /ˈkɑstəloʊ/

Costello (countable and uncountable, plural Costellos)

1. A surname from Irish.
2. A locality in the Barkly Region, Northern Territory, Australia, named after John Costello (pastoralist).

• Costello syndrome

• According to the 2010 United States Census, Costello is the 1093^rd most common surname in the United States, belonging to 32043 individuals. Costello is most common among White (90.85%) individuals.

• Costelloe

• Hanks, Patrick, editor (2003), “Costello”, in Dictionary of American Family Names, volume 1, New York: Oxford University Press, →ISBN, page 373.