Family name Kagaya (Kagaya 
, Кагая 
) , in the world, is a rare last name. The surname Kagaya is habitual in Japan, where it is a very rare surname, Tanzania, and Argentina. Not in comparison with a country's population, this name is the most popular in Japan, Tanzania, and the United States. Likewise, Kagaya is the forename as well as the last name.
| ken kagaya Japanese writer and painter (1944-2003) (b. 1944) |
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| noritaka kagaya researcher |
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| keiko kagaya botanist |
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| kagaya kichiemon Edo publisher |
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| kagaya yasubei Edo publisher |
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| takashi kagaya Ph.D. Tokyo Institute of Technology 2017 |
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| hitoshi kagaya researcher |
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| katsushi kagaya researcher (ORCID 0000-0003-3001-7690) |
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| yuta kagaya researcher |
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| katsushi kagaya |
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