Surname Mu'In (معین 
, מועין 
, Муин 
) , globally, is quite a rare cognomen. The family name Mu'In is habitual in Indonesia, where it is a rare surname, Malaysia, and Iran, where it is a very rare surname. Likewise, Mu'In is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| معین | Saudi Arabia, Afghanistan, Iran |
| מועין | Israel |
| Муин | Russia, Kyrgyzstan, Kazakhstan |
| Mu'In | Indonesia, Malaysia |
| mu'in al-din kashani Iranian Islamic scholar and poet, IR (b. 1646) |
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| fatkur mu'in Indonesian politician (born 1970 in Bojonegoro), ID (b. 1970) |
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| mu'in ad-din unur 12th century ruler of Damascus, SY |
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| mu'in al-din hasan ibn al-shaykh |
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