Family name Iwase (イワセ 
, Iwase 
) , throughout the world, is a rare cognomen. The surname Iwase is habitual in Hong Kong, where it is a rare surname, Japan, and Singapore. Measured by absolute frequency, the name is most common in Japan, Brazil, and the United States. More frequently, Iwase is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| イワセ | Japan |
| Iwase | Brazil, Japan, China, United States, India |
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iwase tadanari Japanese military officer and diplomat (b. 1818) |
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randy iwase American politician, US (b. 1947) |
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| yoshiyuki iwase JP (b. 1904) |
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| tarō iwase (b. 1906) |
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| kōichi iwase (b. 1917) |
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| hidekazu iwase (b. 1934) |
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| tappi iwase Japanese jazz drummer, composer, arranger (1967-), JP (b. 1967) |
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| koji iwase botanist |
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| ryota iwase researcher |
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| akira iwase researcher (ORCID 0000-0003-3294-7939) |
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| kenji iwase researcher |
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| aiko iwase researcher (ORCID 0000-0001-5950-4260) |
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| shigeki iwase researcher ORCID ID = 0000-0003-2280-7422 |
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| eiji iwase researcher |
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| norio iwase D.Sc. Kyushu University 1988 |
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