Surname Fay (Fay 
, フェイ 
, فاي 
, and others...) , all around the world, is a common family name. The cognomen Fay is habitual in Ireland, where it is quite a common surname, Hungary, where it is quite a rare surname, and Australia. Measured by absolute frequency, it most frequently occurs in the United States, France, and Indonesia. Also, Fay is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Fay | Indonesia, United Kingdom, Algeria, United States, France |
| フェイ | Japan |
| فاي | Saudi Arabia, Sudan, Egypt, Libya, Iraq |
| פיי | Israel |
| Фэй | Kyrgyzstan, Russia |
| 费伊 | China |
| Фай | Kazakhstan, Russia, Kyrgyzstan, Belarus, Ukraine |
Fahy, Faie, Fair, Faith, Fake, Fang, Faý, Faÿ, Feague, Fee, Fegien, Fei, Feie, Feyen, Fày, Fàý, Fàÿ, Fàŷ, Fáy, Fáý, Fây, Fâý, Fâÿ, Fãy, Fãý, Fãÿ, Fāy, Fāý, Fāÿ, Făy, Făý, Fąý, Fąŷ, Ofay, Phaÿ, Pháy, Phây, Phâÿ, Phãý, Phãÿ, Phạy, Phấy, Phẩy, Фаи, Фаы, Фей, فأي, فاى, เฟย์, ၾယ္, ហ្វាយ, 菲, 菲怡, and 费
| nicholas de fay, seigneur de coisse et saint-quintin-l'herm 23 Nov 1614 Arlanc - (b. 1614) |
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| jacob frederik du fay 1646 Frankfurt - 25 Aug 1691 Amsterdam (b. 1646) |
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| étienne de fay (b. 1669) |
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| jacob frederik du fay nobleman (1682-1734) (b. 1682) |
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| jan noach du fay 18 Aug 1683 - 1737 (b. 1683) |
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| florimond de fay, seigneur de coisse, saint-quentin-l'herm 1687 Coisse - 6 Aug 1749 Coisse (b. 1687) |
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| john fay (1699-1731) (b. 1699) |
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| claude florimond de fay, marquis de la tour maubourg et de galande 17 Oct 1716 Coisse - 1790 (b. 1716) |
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| maria du fay 9 Jan 1717 - 18 Aug 1743 (b. 1717) |
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| jonathan fay (1724-1800) (b. 1724) |
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| solomon fay 17 Feb 1734 Westborough, MA - 22 Nov 1818 (b. 1734) |
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| martin fay (b. 1724) |
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| jonas fay American judge (b. 1737) |
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| elizabeth fay 9 Dec 1740 Westborough, MA - 18 Aug 1777 Westborough, MA (b. 1740) |
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francis b. fay American politician (1793-1876), US (b. 1793) |
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