Family name Giay (Giay 
) , across the world, is a rare cognomen. The last name Giay is habitual in Argentina, where it is a rare surname, Hungary, and Austria. Not in comparison with a country's population, the name is most common in Indonesia, Argentina, and Italy. Much less frequently, Giay is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Giay | Myanmar, Italy, Vietnam, Indonesia, Argentina |
| giovanni antonio giay Italian composer, IT (b. 1690) |
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| francesco saverio giay (1729-1801) (Italy) (b. 1729) |
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| benny giay academician, church leader, social activist, ID (b. 1955) |
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| zakharias giay ID (b. 1960) |
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| ligia giay PhD candidate at the Asia Research Centre at Murdoch University in Perth, and a frequent author on racism against Papuans |
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| agustín giay Argentine footballer, AR |
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Mr, Omar, Quat, Maria, Melvi, Celia, Paola, Paolo, Ribka, Ruben, Dante, Diego, Lella, Lidya, Liria, Jacky, Julio, Tenua, Nancy, Nilda, Elena, Eleis, Irma, Ester, Elda, Elia, Vo, Ana, Ban, Boy, Tui, Hoa, Ida, Mina, Sara, Alex, Abel, Karl, Kata, Rita, Deki, Danh, Dora, Luca, Luis, Jose, Juan, Elsa, and Viqii