In the world, Ain (Ain 
, اين 
, Айн 
) is a common unisex first name. The given name Ain is characteristic of Brunei, where it is quite a common feminine name, Aruba, and Estonia, where it is quite a rare boy's name. In absolute terms, it is commonest in Pakistan, Indonesia, and India. Also, Ain is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Ain | Myanmar, Pakistan, Indonesia, Malaysia, India |
| اين | Iran, Egypt, Sudan, Iraq, Algeria |
| Айн | Ukraine, Russia, Estonia |
| Hinnis | United Kingdom, Turkey, Bulgaria |
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ain kaalep Estonian writer and politician (1926-2020), EE (b. 1926) |
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ain amjärv Estonian architect, EE (b. 1927) |
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ain erik Estonian forestry personnel and conservationist, EE (b. 1932) |
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ain kallis Estonian climatologist, EE (b. 1942) |
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ain heinaru Estonian geneticist, EE (b. 1943) |
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| ain rannaleet Estonian writer, EE (b. 1904) |
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ain mäesalu Estonian archaeologist, EE (b. 1955) |
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| ain kalmus Estonian writer and theologian, EE (b. 1906) |
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ain saarna Estonian journalist, EE (b. 1958) |
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| ain eenmaa Estonian clergyman, EE (b. 1909) |
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ain tähiste Estonian lawyer and politician (b. 1960) |
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| ain ruuvet (b. 1914) |
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ain aaviksoo Estonian physician, EE (b. 1974) |
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ain kaljurand EE (b. 1965) |
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ain rool EE (b. 1966) |
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