Last name Oi (爱 
, Oi 
, 愛 , and others...) , worldwide, is a widespread cognomen. The cognomen Oi is characteristic of China, where it is quite a common surname, Malaysia, and Macao, where it is quite a rare surname. In absolute terms, this name is the most popular in China, Indonesia, and Malaysia. Very seldom, Oi is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| 愛, 哀, 爱 | China |
| Oi | Indonesia, Taiwan, Ivory Coast, Malaysia, China |
| オイ | Japan |
Ai, Ei, Hoy, Ii, Ikii, Ikui, Kii, Namai, Nasui, Odium, Ooi, Ouï, Oí, Oï, Oǐ, Seii, Shohi, Shoi, Shoui, Syoi, Syoui, Ubui, Ui, Umai, Ài, Ái, Òi, Òï, Ói, Ôi, Ôì, Ôî, Āi, Ōi, Ōī, Šói, Ơi, Ǎi, Ои, Оои, Оі, أوي, ঐ, ওই, ออย, อ่อย, อ้อย, อ๋อย, โอ้ย, โอ๋ย, Ọi, Ỏi, Ối, Ổi, Ới, Ời, Ởi, Ợi, うい, エ, オオイ, 大井, 生井, 蔼, 霭, 靄, Ｏī, and Ｏｉ
| walter oi American economist, US (b. 1929) |
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| jean c. oi academic (b. 1949) |
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| oi ki ling (b. 1953) |
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| cintia akemi oi researcher |
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| oi leng tan researcher (ORCID 0000-0002-6372-9291) |
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| rie oi researcher |
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| oi lian kon researcher |
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| toru oi researcher |
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| manabu oi researcher |
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| katsuya oi researcher (ORCID 0000-0003-4751-6373) |
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| oi lun li researcher |
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| oi choong Australian landscape architect and urban designer |
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| yasufumi oi researcher ORCID ID = 0000-0003-1956-9662 |
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| daniel k.l. oi researcher ORCID ID = 0000-0003-0965-9509 |
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| masao oi Ph.D. University of Tokyo 2019 |
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