Surname Costley (Costley 
) , throughout the world, is quite a rare last name. The cognomen Costley is habitual in Isle of Man, where it is quite a rare surname, Jamaica, and New Zealand. Measured by absolute frequency, it is commonest in the United States, the United Kingdom, and Jamaica.
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| Costley | Australia, Canada, Jamaica, United Kingdom, United States |
| anne costley (born 1769) (b. 1769) |
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| william robert clayton costley (1778-1866) (b. 1778) |
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| edward costley New Zealand philanthropist, NZ (b. 1794) |
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| john worsley waterloo costley (1825-1909) (b. 1825) |
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| james costley English footballer (1862-1931), GB (b. 1862) |
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| charles gladstone costley Jamaican mathematician, JM (b. 1928) |
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| william k. costley (b. 1942) |
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| phil costley New Zealand athlete, NZ (b. 1970) |
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| louisa engleheart costley Peerage person ID=664898 |
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| tim costley National Party candidate in the 2020 New Zealand general election, NZ |
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| david costley-wood Treasurer of Manchester Literary and Philosophical Society |
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| matthew costley researcher (ORCID 0000-0003-3426-3661) |
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| jimmy costley English football player |
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| emily maria costley (died 1866) |
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| debra costley researcher ORCID ID = 0000-0001-9824-8853 |
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