Surname Decosta (Decosta 
) , throughout the world, is quite a rare cognomen. The surname Decosta is habitual in Bahamas, where it is quite a rare surname, Mauritius, and Bahrain. Measured by absolute frequency, it most frequently occurs in the United States, Bangladesh, and Philippines. Very seldom, Decosta is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Decosta | United States, Sri Lanka, India, Bangladesh, Philippines |
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benjamin franklin decosta Union Army chaplain, US (b. 1831) |
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| pam decosta American basketball player (1964-), US (b. 1964) |
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| eric decosta American football executive, US (b. 1971) |
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| patricia decosta researcher (ORCID 0000-0002-4463-2224) |
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| charles decosta college basketball player (2010–2011) Howard |
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