Cognomen Inagaki (イナガキ 
, Inagaki 
, Инагаки 
) , in the world, is quite a rare last name. The cognomen Inagaki is characteristic of Taiwan, where it is a rare surname, Japan, and Brazil. Measured by absolute frequency, the name is most common in Japan, Brazil, and the United States. More frequently, Inagaki is the forename as well as the last name.
| VARIANT | COUNTRY |
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| イナガキ | Japan |
| Inagaki | China, Japan, Brazil, United States, Taiwan |
| Инагаки | Russia |
| inagaki shigefusa (b. 1670) |
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| inagaki terukata (b. 1698) |
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| inagaki sadakazu (1728-1804) (b. 1728) |
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inagaki motoyoshi painter (1859-1932) (b. 1859) |
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| inagaki nagaakira (b. 1830) |
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| inagaki motokiyo (b. 1840) |
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| inagaki masuho (b. 1858) |
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genshirō inagaki (b. 1911) |
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| tomoo inagaki Japanese artist (1902–1980), JP (b. 1902) |
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| kan-ichi inagaki botanist, JP (b. 1908) |
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| minoru inagaki (b. 1899) |
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| bernard r. inagaki Japanese philosopher, JP (b. 1928) |
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| naoki inagaki botanist (b. 1929) |
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| m. inagaki (b. 1923) |
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| jiro inagaki Japanese jazz saxophonist, bandleader, and producer (b. 1933) |
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