Surname Horain (Horain 
) , all over the world, is a rare family name. The cognomen Horain is habitual in France, where it is a rare surname, Poland, where it is a very rare surname, and India, where it is an extremely rare surname. Much less frequently, Horain is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Horain | India, United States, Poland, Pakistan, France |
| jan antoni horain LT (b. 1686) |
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| aleksander horain PL (b. 1698) |
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| aleksander horain (b. 1734) |
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| jan nepomucen horain (b. 1760) |
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julian horain PL (b. 1821) |
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| wincenty horain BE (b. 1799) |
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| tadeusz ignacy horain (b. 1804) |
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| daniel horain FR (b. 1945) |
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| patrick horain researcher |
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| bogusław jan horain |
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| jerzy horain |
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| leon horain PL |
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