Cognomen Casasayas (Casasayas 
) , all over the world, is a rare surname. The family name Casasayas is characteristic of Spain, where it is a rare surname, Australia, where it is a very rare surname, and France. More prevalently, Casasayas is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Casasayas | Australia, United States, Spain, France |
| josep gras i casasayas Catalan teacher from the early 20th century, ES (b. 1898) |
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| domènec massagué i casasayas Spanish association football player (1900-1979), ES (b. 1900) |
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| josé maría casasayas Spanish philologist (1937-2004), ES (b. 1927) |
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| josefina casasayas (b. 1957) |
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| séverine casasayas director of Parc naturel régional des Pyrénées catalanes, FR |
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| maría casasayas researcher (ORCID 0000-0003-4183-5832) |
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| josefina casasayas Ph.D. Universidad Autónoma de Barcelona 1984 |
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| carles oliet casasayas researcher ORCID: 0000-0003-2170-5299 |
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| álex casasayas Spanish field hockey player (1988-), ES (b. 1988) |
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| lluís casasayas |
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