Costello

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Costello

/kɑˈstɛloʊ/ US
/ˈkɑstəloʊ/ Ireland

Where it comes from

* 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.

proper noun Costellos · Costilow · Costley · Costlow

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

Thesaurus

Closest in meaning: roberts, hardy, finger, fingers, mathieu, costley, connolly, conley, costlow, costigan, connelly, conolly, conlon, creely, conly, conlan

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Cite this

MLA

"Costello." Wiktionary, via Micwyn, micwyn.com/word/costello. Accessed 6 Nov. 2026.

APA

Costello. (n.d.). In Wiktionary, via Micwyn. Retrieved November 6, 2026, from https://micwyn.com/word/costello

Chicago

"Costello." Wiktionary, via Micwyn. Accessed November 6, 2026. https://micwyn.com/word/costello.

BibTeX

@misc{costello_2026,
  title = {Costello},
  howpublished = {Wiktionary, via Micwyn},
  year = {2026},
  url = {https://micwyn.com/word/costello},
  urldate = {2026-11-06}
}