Surname Ukai (Ukai 
, Укай 
, Укаи ) , in the entire world, is a rare last name. The surname Ukai is characteristic of Kyrgyzstan, where it is a rare surname, Belgium, and Indonesia, where it is a very rare surname. In absolute terms, it most frequently occurs in Indonesia, China, and India. Also, Ukai is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Ukai | Japan, China, Indonesia, Nigeria, India |
| Укай | Kyrgyzstan, Kazakhstan, Russia, Ukraine |
| Укаи | Russia |
| ukai sekisai (b. 1615) |
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| ukai shōsai (b. 1652) |
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| ukai rensai (b. 1693) |
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| satoshi ukai researcher ORCID ID = 0000-0002-9776-8379 |
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| yoshinori ukai researcher |
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| taku ukai researcher (ORCID 0000-0001-9839-7330) |
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| kazuya ukai researcher |
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| katsuyuki ukai researcher (ORCID 0000-0002-7649-2238) |
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| shoichi ukai researcher |
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| tomohiko ukai researcher (ORCID 0000-0002-0764-0110) |
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| takashi ukai researcher |
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| hiroki ukai researcher |
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| taku ukai researcher (ORCID 0000-0001-6506-0125) |
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| kōsuke ukai Japanese baseball player (b. 1999) |
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