Family name Casaca (Casaca 
) , globally, is quite a rare last name. The surname Casaca is habitual in Portugal, where it is quite a common surname, Honduras, where it is quite a rare surname, and Angola, where it is a rare surname. Measured by absolute frequency, it is the most numerous in Portugal, Honduras, and Brazil.
| VARIANT | COUNTRY |
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| Casaca | Portugal, Angola, Honduras, Argentina, Brazil |
| paulo casaca Portuguese politician, PT (b. 1957) |
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| rui casaca Portuguese association football player, PT (b. 1959) |
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| antónio casaca researcher |
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| fátima casaca researcher |
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| ana casaca researcher |
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| cláudia s. s. l. casaca researcher ORCID ID = 0000-0003-4556-4101 |
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| a. casaca researcher ORCID ID = 0000-0003-3969-1219 |
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| sara falcão casaca researcher ORCID ID = 0000-0002-7944-5007 |
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| daniel casaca Canadian rower, CA (b. 1984) |
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