Family name Doi (ドイ 
, Doi 
, دوي 
, and others...) , worldwide, is a common surname. The family name Doi is habitual in Myanmar, where it is quite a common surname, Palestinian Territory, where it is quite a rare surname, and Malaysia. Measured by absolute frequency, it is the most numerous in Myanmar, India, and Brazil. More prevalently, Doi is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| ドイ | Japan |
| Doi | Brazil, Myanmar, India, Indonesia, United States |
| دوي | Iraq, Egypt, Sudan, Palestinian Territory, Algeria |
| 도이 | South Korea |
| Дои | Russia |
Caduf, Dao, Deus, Deux, Devoir, Dia, Doigt, Doilea, Doll, Doski, Doí, Doï, Due, Duim, Duit, Duo, Dwe, Dé, Dòi, Dói, Dôi, Dôì, Dõi, Dīn, Dōî, Dơi, Dỏi, Dối, Dốï, Dỗi, Dội, Dới, Dời, Dởi, Dợi, Odoi, Toi, Tsuchii, Tuchii, Tutii, Đoi, Đói, Đôi, Đõi, Đơi, Đơì, Đọi, Đối, Đồi, Đổi, Đỗi, Đội, Đới, Đời, Đờï, Đợi, Дой, Доі, Цутии, دوى, ดอย, ดอยซ์, ดอยล์, โดย, どい, 多伊, and Ｄōī
| doi toshitaka (b. 1619) |
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| doi toshifusa (b. 1631) |
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| doi toshinaga (b. 1631) |
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| doi toshinao (b. 1637) |
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| doi toshishige (b. 1647) |
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| toshimoto doi (b. 1664) |
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| doi toshizane (b. 1690) |
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| doi toshitsune (b. 1703) |
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| doi toshihiro (b. 1718) |
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| doi toshinobu (b. 1723) |
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| doi toshinobu (b. 1728) |
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| doi toshisada (b. 1741) |
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| doi toshinari (b. 1748) |
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| doi toshichika (b. 1758) |
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| doi toshiatsu (b. 1759) |
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