Last name Riwai (Riwai 
) , worldwide, is a very rare cognomen. The cognomen Riwai is characteristic of New Zealand, where it is a rare surname, Australia, where it is a very rare surname, and Indonesia. Likewise, Riwai is the forename as well as the last name.
| riwai te ahu New Zealand teacher and missionary, NZ (b. 1820) |
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| kiti karaka riwai Moriori and Ngati Mamoe; founding mother, NZ (b. 1870) |
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| te kiato riwai Ngai Tahu and Ngati Mutunga; nurse, Maori welfare officer, NZ (b. 1912) |
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| riwai te-ranga-nui-a-tai wiremu (1946-1995) (b. 1946) |
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| viniana riwai Fijian rugby and association football player, FJ (b. 1991) |
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