Last name Ooi (Ooi 
, オオイ 
) , across the world, is a common surname. The family name Ooi is habitual in Malaysia, where it is a common surname, Singapore, where it is quite a common surname, and Cayman Islands. Measured by absolute frequency, this name is the most popular in Malaysia, Singapore, and Australia. Also, Ooi is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Ooi | Australia, Taiwan, Singapore, Indonesia, Malaysia |
| オオイ | Japan |
| ooi manabu Japanese Esperantist, JP (b. 1887) |
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imee ooi Chinese-Malaysian Buddhist singer, MY (b. 1950) |
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jeff ooi Malaysian politician, MY (b. 1956) |
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joanne ooi Singaporean environmentalist, SG (b. 1967) |
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| ooi teik hock Malaysian badminton player (1920-1983), MY (b. 1920) |
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| ooi hock lim Malaysian sprinter, MY (b. 1943) |
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| ooi eow jin (b. 1938) |
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| ooi chai lim MY (b. 1943) |
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| ooi boon ewe Singaporean politician (b. 1958) |
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| ooi kee beng (b. 1955) |
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| kee beng ooi (b. 1955) |
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| keat gin ooi (b. 1959) |
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| patrick tan boon ooi A Senior Investigator and Associate Director of Genome Medicine at the Genome Institute of Singapore, SG (b. 1969) |
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| ooi hoe guan Malaysian footballer, MY (b. 1973) |
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| may ooi Singaporean swimmer (b. 1976) |
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