Family name Oei (Oei 
, เอ้ย, เอ๋ย) , around the globe, is a common cognomen. The cognomen Oei is habitual in Bermuda, where it is quite a common surname, Singapore, where it is quite a rare surname, and Indonesia. Not in comparison with a country's population, it is the most numerous in Indonesia, the United States, and Netherlands. Also, Oei is the forename as well as the last name.
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| Oei | Japan, Indonesia, Malaysia, Singapore, United States |
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oei tiong ham Indonesian businessman, ID (b. 1866) |
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oei hui-lan Chinese-Indonesian socialite, ID (b. 1889) |
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| lily anwar oei wife of Indonesian businessman William Soeryadjaya, ID (b. 1923) |
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martin oei Dutch pianist, NL (b. 1996) |
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| loan oei exhibitions curator. She also writes and lectures on textiles., ID (b. 1947) |
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| david oei American musician, US (b. 1950) |
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| angela oei Oei Hong Leong's wife (b. 1952) |
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| marc oei German architect (b. 1962) |
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| fransiska oei (b. 1957) |
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| daniella oei badminton player, NL (b. 1968) |
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| pam oei Singaporean actress, SG (b. 1972) |
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| hendro susanto oei (b. 1964) |
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| bernd oei DE (b. 1966) |
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| alan oei artist and curator from Singapore (b. 1976) |
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| martin oei Hong Kong critic, GB (b. 1978) |
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