All over the world, Tetsuhiro (Tetsuhiro 
, 사이) is a rare boy's first name. The given name Tetsuhiro is habitual in Eastern Asia, particularly Japan, where it is a very rare boy's name, and China, where it is an extremely rare masculine name. Likewise, Tetsuhiro is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Tetsuhiro | Japan, China, United States, Canada, Brazil |
| tetsuhiro hokama TW (b. 1944) |
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| tetsuhiro minami (b. 1945) |
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| tetsuhiro daiku (b. 1948) |
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| tetsuhiro kajikawa researcher (ORCID 0000-0001-8416-9126) |
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| tetsuhiro nemoto researcher |
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| tetsuhiro tsuruma researcher |
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| tetsuhiro harimoto researcher ORCID 0000-0001-8859-7494 |
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| tetsuhiro tanaka researcher |
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| tetsuhiro tsujino researcher |
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| tetsuhiro s hatakeyama researcher |
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| tetsuhiro maeno researcher |
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| tetsuhiro kudo researcher (ORCID 0000-0002-7339-7745) |
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| tetsuhiro watanabe researcher |
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| tetsuhiro shimodaira researcher (ORCID 0000-0002-3926-325X) |
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| tetsuhiro owaki researcher |
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