Cognomen Roy (Roy 
, Roi , רועי 
, along with others...) , across the world, is a prevalent last name. The last name Roy is habitual in Bangladesh, where it is a common surname, India, and Israel (explore the name in all countries). In absolute terms, it is commonest in India, Bangladesh, and the United States. Much less frequently, Roy is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Roi, Roy | Bangladesh, Philippines, United States, India, Indonesia |
| רוי, רועי | Israel |
| روي | Iraq, Egypt, Sudan, Lebanon, Saudi Arabia |
| ロイ | Japan |
| Рой | Ukraine, Kazakhstan, Belarus, Russia, Kyrgyzstan |
| 罗伊, 羅伊 | China |
King, Leroy, Rei, Rex, Rojs, Roye, Roý, Roÿ, Roƴ, Ruadh, Ròy, Ròý, Róy, Rôy, Rôÿ, Rõy, Rõý, Rõÿ, Rōy, Rőy, Rőý, Rơy, Ŕoy, Ŕoý, Ŕòy, Ŕòý, Ŕóý, Ŕôý, Ŕôÿ, Ŕõÿ, Ŕőý, Ŕőŷ, Řoy, Řoý, Řòý, Řóý, Řôý, Řôÿ, Řõý, Řõÿ, Řōÿ, Řőý, Řőÿ, Лерой, Леруа, Рои, Роы, Руа, رائے, روى, روی, لوروا, राय, रॉय, রায়, รอย, โรย, រ៉ូយ, ローイ, and Ｒoy
| roy henry British composer, GB (b. 1350) |
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| pierre le roy (b. 1350) |
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| william roy Observantine Franciscan and reformer, FR (b. 1500) |
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| jacques le roy (b. 1569) |
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| henri le roy (b. 1579) |
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| apollinaris roy CH (b. 1584) |
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| jacob le roy Flemish historian, BE (b. 1633) |
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| thomas le roy FR (b. 1637) |
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| peter van roy Flemish 1683–1740 F:0, BE (b. 1660) |
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| jean roy ZA (b. 1650) |
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| esther le roy FR (b. 1652) |
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| anna maria de roy 1669 Alicante, Spain - 3 Nov 1700 Amsterdam (b. 1669) |
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| pierre le roy born 1675; died 1759 (b. 1675) |
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| pierre-charles roy French poet, FR (b. 1683) |
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| charles le roy 1690-1739 (b. 1690) |
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