Surname Cayco (Cayco 
) , in the entire world, is quite a rare family name. The surname Cayco is habitual in Peru, where it is quite a rare surname, Philippines, where it is a rare surname, and Singapore. Measured by absolute frequency, it is the most numerous in Philippines, Peru, and the United States. Very seldom, Cayco is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Cayco | Philippines, Saudi Arabia, United States, Peru, Canada |
| jacinto cayco Filipino swimmer, PH (b. 1924) |
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marilou cayco Filipina politician from Batanes island, PH |
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| pedro cayco Filipino swimmer, PH (b. 1932) |
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| maria esperanza s. cayco Ph.D. Carnegie Mellon University 1985 |
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Fe, Glen, Leni, Lina, Lito, Lian, Luis, Lulu, Jana, Jose, John, Jean, July, Juan, Jill, Neil, Neda, Nhil, Elsa, Elma, Edna, Maria, Gina, Dhey, Dino, Ruth, Mar, Ann, Bea, Pia, Rio, Gil, Lan, Lou, Joy, Jun, Marie, Emy, Marc, Mark, Myla, Sean, Alex, Anna, Chad, Ceon, Rosa, Rita, Vie, and Marco