Cognomen Hirai (ヒライ 
, Hirai 
, Хираи 
) , all around the world, is quite a rare last name. The last name Hirai is habitual in Hong Kong, where it is quite a rare surname, Paraguay, and North Macedonia, where it is a rare surname. Measured by absolute frequency, the name is most common in Japan, Brazil, and the United States. More frequently, Hirai is the forename as well as the last name.
| hirai kinza JP (b. 1859) |
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| masanobu hirai Japanese landscape architect (b. 1924) |
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| hidematsu hirai JP (b. 1920) |
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| takeshi hirai (b. 1936) |
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| katsutoshi hirai (b. 1940) |
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| shingo hirai Japanese amateur wrestler, JP (b. 1978) |
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| akiko hirai researcher |
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| mitsuhiro hirai researcher |
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| teruhisa hirai researcher |
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| shigeto hirai researcher |
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| toshiro hirai researcher |
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| atsushi hirai Japanese carcinologist, JP |
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| jun hirai researcher |
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| daichi hirai researcher |
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| daniel m hirai researcher |
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