Surname Koay (Koay 
) , around the world, is a common family name. The family name Koay is habitual in Malaysia, where it is quite a common surname, Singapore, and Australia, where it is quite a rare surname. Also, Koay is the forename as well as the last name.
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| Koay | Singapore, Malaysia, Taiwan, Australia, United States |
| koay teng hai Malaysian politician, MY (b. 1973) |
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| abigail koay reseacher in New Zealand |
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| sue ann koay researcher |
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| gregory f l koay researcher |
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| siew-tin koay Ph.D. University of California, Berkeley 1971 |
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| doreen s c koay researcher |
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| evelyn siew-chuan koay researcher (ORCID 0000-0001-6472-1462) |
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| sue ann koay particle physicist at UCSB |
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| su-yin koay researcher |
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| jun yi koay researcher ORCID ID = 0000-0002-7029-6658 |
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| wei li a koay researcher ORCID ID = 0000-0002-8825-7067 |
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| godwin koay Singapore artist |
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| hui-fern koay researcher |
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| eugene j koay researcher |
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