Family name Nagasawa (ナガサワ 
, Nagasawa 
) , globally, is quite a rare cognomen. The surname Nagasawa is habitual in Singapore, where it is a rare surname, Estonia, and Japan. Measured by absolute frequency, it is commonest in Japan, Brazil, and the United States. More frequently, Nagasawa is the forename as well as the last name.
| VARIANT | COUNTRY |
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| ナガサワ | Japan |
| Nagasawa | China, Japan, Indonesia, Brazil, United States |
| ujiharu nagasawa (b. 1912) |
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| mitsuru nagasawa (b. 1923) |
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| issaku nagasawa (b. 1926) |
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| masayoshi nagasawa 1940- (b. 1940) |
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| eiji nagasawa botanist (b. 1948) |
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| nobuho nagasawa multidisciplinary installation artist (b. 1960) |
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| hiroki nagasawa researcher (ORCID 0000-0001-7972-2425) |
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| yoshinobu nagasawa researcher (ORCID 0000-0001-5689-1031) |
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| masayuki nagasawa researcher (ORCID 0000-0003-1299-6354) |
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| h nagasawa researcher |
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| yoshiaki nagasawa Japanese cycle manufacturer |
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| yujin nagasawa researcher |
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| masayuki nagasawa researcher (ORCID 0000-0002-8085-4940) |
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| herbert nagasawa researcher |
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| motonori nagasawa researcher |
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