Surname 哲也 (Fujita 
, 哲也 ) , all over the world, is quite a common family name. The family name 哲也 is habitual in Singapore, where it is quite a rare surname, Japan, and Cyprus. Not in comparison with a country's population, it is the most numerous in Japan, Brazil, and the United States. Also, 哲也 is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Fujita | Japan, Brazil, China, United States, Indonesia |
| 哲也 | China |
| 青山 哲也 Japanese actor (1940-2006), JP (b. 1940) |
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| かとう 哲也 Japanese actor (1941–1983), JP (b. 1941) |
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| 森谷 哲也 JP (b. 1933) |
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| 井崎 哲也 Japanese actor, JP (b. 1952) |
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| 細岡 哲也 medical researcher in Japan, JP |
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