English Wikipedia has an article on:

Costello

Wikipedia

Alternative forms

Costilow, Costley, Costlow

Etymology

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”).

Pronunciation

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

Proper noun

Costello (countable and uncountable, plural Costellos)

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

Derived terms

Costello syndrome

Statistics

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.

See also

Costelloe

Further reading

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