All around the world, Masahisa (昌久 
, 正久 , Masahisa 
) is quite a rare boy's forename. The forename Masahisa is habitual in China, where it is a rare masculine name, Japan, where it is a very rare boy's name, and Brazil, where it is an extremely rare feminine name. Very seldom, Masahisa is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| 昌久, 正久 | China |
| Masahisa | Brazil, China, United States, Japan, India |
| amago masahisa (b. 1488) |
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| hatakeyama masahisa (b. 1533) |
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| matsudaira masahisa daimyo of Otaki (b. 1659) |
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| masahisa isogai (b. 1679) |
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| masahisa kawabe (b. 1901) |
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| masahisa adachi born:1932-02-07|died:1993|; 足立, 正久, 1932-1993; Adachi, Masahisa; 足立, 正久 (b. 1932) |
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| masahisa suzuki (b. 1969) |
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| masahisa katsuno researcher |
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| masahisa hasegawa botanist |
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| masahisa horiuchi researcher |
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| masahisa nakada researcher |
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| masahisa wada scientist, JP |
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| masahisa ishibashi researcher |
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| masahisa ohkuma researcher |
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| masahisa osawa researcher |
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