Cognomen Idei (Idei 
) , around the world, is a rare family name. The surname Idei is habitual in Cayman Islands, where it is quite a rare surname, Hong Kong, where it is a rare surname, and Hungary. In absolute terms, it is commonest in Hungary, Hong Kong, and Indonesia. Also, Idei is the forename as well as the last name.
| seitarō idei (b. 1899) |
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| yoshio idei (b. 1908) |
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| masahito idei botanist (b. 1953) |
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| yoshihiko idei botanist |
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| masafumi idei researcher |
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| takashige idei |
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| toshihiro idei Japanese baseball player (b. 1997) |
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