Last name Costello (Costello 
, קוסטלו 
, Костелло 
) , worldwide, is a common family name. The family name Costello is characteristic of Ireland, where it is a common surname, Cayman Islands, where it is quite a common surname, and Australia (explore the name in all countries). Measured by absolute frequency, this name is the most popular in the United States, the United Kingdom, and Ireland.
| thomas costello Roman Catholic bishop (b. 1744) |
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| mary ann costello Irish actress (1747-1827), GB (b. 1747) |
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louisa stuart costello British miniature painter and author, FR (b. 1799) |
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john costello Australian pastoralist, AU (b. 1838) |
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| edward costello (b. 1788) |
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| william birmingham costello Irish surgeon, IE (b. 1800) |
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peter e. costello American politician, US (b. 1854) |
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eileen costello Irish politician, writer, teacher and folklorist, IE (b. 1870) |
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| patrick costello (1824-1896) publican, contractor and politician, IE (b. 1824) |
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| ann claugher costello (b. 1815) |
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louis b. costello American banker and newspaper publisher, US (b. 1876) |
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maurice costello American actor and film director (1877-1950), US (b. 1877) |
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mae costello American actress (1882-1929), US (b. 1882) |
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edward costello Australian politician and soldier, AU (b. 1883) |
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cecilia costello British singer, GB (b. 1884) |
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