Word.ws English Dictionary

Costello

US/kɑˈstɛloʊ/

More pronunciations (1)Fewer pronunciations

Ireland/ˈkɑstəloʊ/

Costello proper noun: a surname from Irish.

Proper noun

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).

Forms of Costello

pluralCostellos
alternative formCostilow
alternative formCostley
alternative formCostlow

Origin of Costello

* 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.

Words formed from Costello

Questions about Costello

What does Costello mean?
Costello means a surname from Irish.
What part of speech is Costello?
Costello is a proper noun.
How do you pronounce Costello?
Costello is pronounced /kɑˈstɛloʊ/ (US).

Words near Costello in the dictionary

  1. Costeff syndrome
  2. costellariid
  3. costellariids
  4. costellate
  5. costellated
  6. Costello
  7. Costello syndrome
  8. Costelloe
  9. Costellos
  10. costen
  11. Costen's syndrome

Source and license

Adapted from Wiktionary: Costello (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

Last updated:

Cite this entry: “Costello.” Word.ws, https://word.ws/costello. Based on Wiktionary, CC BY-SA 4.0.