Surname Gancayco (Gancayco 
) , all over the world, is a rare family name. The family name Gancayco is habitual in United Arab Emirates, where it is a rare surname, Philippines, and the United States, where it is a very rare surname. Much less frequently, Gancayco is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Gancayco | Philippines, Spain, United Arab Emirates, United States, Canada |
| emilio gancayco Filipino lawyer, PH (b. 1921) |
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| emilio a. gancayco (b. 1921) |
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| christina gancayco researcher (ORCID 0000-0002-2845-2565) |
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