Cognomen Hasdai (Hasdai 
, חסדאי ) , in the entire world, is a rare surname. The cognomen Hasdai is habitual in Israel, where it is quite a rare surname, the United States, where it is an extremely rare surname, and India. Much less frequently, Hasdai is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Hasdai | India, Israel, United States |
| חסדאי | Israel |
| abu al-fadl ibn hasdai Spanish writer, ES (b. 1050) |
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| abraham hasdai late 13th century translator from Arab to Hebrew in Barcelona, ES (b. 1180) |
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| hasdai ben judah crescas Talmudist, grandfather of Hasdai Crescas (b. 1201) |
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| hasdai cresques Spanish philosopher, ES (b. 1340) |
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| hasdai todros participant at the Disputation of Tortosa, AD |
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| hasdai almosnino Chief Rabbi of Tetuan in 18th |
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| hasdai i Jewish Exilarch |
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| david hasdai |
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Mr, Ziyv, Mazal, Moran, Moshe, Meiyr, Sarah, Shani, Shlmh, Sigal, Amiyt, Asher, Aharn, Berta, Ronen, Danah, David, Tomer, Nisim, Ester, Efrat, Haviv, Zahi, Yael, Orly, Idan, Aya, Ben, Gal, Tal, Noa, Nes, Ido, Ori, Udi, Sara, Hilah, Shay, Adiy, Aviy, Koby, Leon, Tova, Neta, Elay, Erez, Haim, Hila, Alon, and Isaac