Surname Costelloe (Costelloe 
) , in all the world, is quite a rare family name. The last name Costelloe is characteristic of Ireland, where it is quite a common surname, Trinidad and Tobago, where it is quite a rare surname, and New Zealand. Measured by absolute frequency, it is the most numerous in Ireland, Australia, and the United Kingdom. Very seldom, Costelloe is the forename as well as the last name.
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| Costelloe | United Kingdom, Australia, United States, New Zealand, Ireland |
| benjamin francis conn costelloe Irish barrister and political reformer; first husband of Mary Berenson (b. 1855) |
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| tom costelloe Irish Gaelic footballer, IE (b. 1887) |
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paul costelloe Irish fashion designer, IE (b. 1945) |
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timothy costelloe Australian Roman Catholic archbishop, AU (b. 1954) |
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| m. joseph costelloe birthdate: 1914 deathdate: 2000 viaf: 63215223 alias: Costelloe, Martin Joseph; Costelloe, Martin Josef (b. 1914) |
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| tom costelloe (b. 1931) |
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| john costelloe American actor (1961-2008), US (b. 1961) |
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| timothy m. costelloe (b. 1964) |
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| hugh john costelloe (born 1974) (b. 1974) |
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| nicola costelloe (born 1977) (b. 1977) |
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| john t. costelloe Peerage person ID=583725 |
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| seán j costelloe researcher |
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| colleen mary rona costelloe Peerage person ID=293566 |
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| céire e costelloe researcher |
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| jessie katherine costelloe Peerage person ID=686173 |
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