Cognomen Caia (Caia 
, كايا 
, Кайя 
) , throughout the world, is quite a common last name. The family name Caia is habitual in Romania, where it is quite a rare surname, Sudan, and Italy. In absolute terms, it is commonest in Brazil, Romania, and Italy. Much less frequently, Caia is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Caia | Romania, France, Argentina, Italy, Brazil |
| كايا | Iraq, Egypt, Sudan, Saudi Arabia, Algeria |
| Кайя | Kazakhstan, Russia, Ukraine |
| Cajado | France, Argentina, Italy, Brazil, United States |
| caia aarup greene DK (b. 1868) |
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caia morstad volleyball player and 2007 Calgary Stampede Princess, CA (b. 1982) |
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caia van maasakker Olympic field hockey player, NL (b. 1989) |
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| caia coley American actress, US (b. 1968) |
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| caia dominicus researcher (ORCID 0000-0002-6159-2922) |
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| caia morstad |
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| alexandru caia Romanian association football player, RO |
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Mr, Jose, John, Joao, Jean, Juan, Tina, Edna, Erik, Enzo, Luis, Hugo, Fonz, Iris, Ioan, Olga, Maria, Mario, Marta, Marco, Maree, Vlad, Luca, Gina, Dany, Ms, Jo, Ale, Ana, Amy, Ady, Teo, Ian, Ion, Ugo, Melo, Sara, Sami, Saul, Seba, Alex, Anna, Anca, Paul, Rosa, Rita, Mauro, and Mihai