Family name Ain (Ain 
, اين 
, Айн 
) , in the world, is a common surname. The surname Ain is habitual in South-eastern Asia, particularly Brunei, where it is quite a common surname, Malaysia, and Singapore, where it is quite a rare surname. Measured by absolute frequency, it is commonest in Malaysia, Pakistan, and Indonesia. Likewise, Ain is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Ain | India, Malaysia, Indonesia, Pakistan, Myanmar |
| اين | Iran, Algeria, Iraq, Egypt, Sudan |
| Айн | Ukraine, Russia, Estonia |
| Hinnis | Turkey, United Kingdom, Bulgaria |
| casimiro ain dancer, AR (b. 1882) |
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| gregory ain American architect, US (b. 1908) |
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| resia ain Polish artist (b. 1910) |
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martin eric ain American-born Swiss bassist (1967–2017), CH (b. 1967) |
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| qurrotul ain Indonesian politician (born 1966 in Tangerang), ID (b. 1966) |
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| justin ain soongie Roman Catholic clergyman (b. 1973) |
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| beth ain American children's book author, US (b. 1975) |
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| khusnul ain researcher (ORCID 0000-0002-8315-7067) |
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| qurratul ain Indonesian political candidate, ID |
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| zahra qurat ul ain researcher |
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| aron ain American software technology executive, author, and CEO of Kronos Incorporated, US |
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| kenneth b ain researcher |
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| huma bader ul ain researcher (ORCID 0000-0001-8001-1743) |
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| qurat ul ain researcher |
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| rupasri ain researcher |
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