Cognomen Iwatsuki (Iwatsuki 
, 岩月 ) , all over the world, is a rare last name. The family name Iwatsuki is habitual in Belgium, where it is a rare surname, Vietnam, where it is a very rare surname, and Japan. Measured by absolute frequency, it is the most numerous in Vietnam, Japan, and the United States. Likewise, Iwatsuki is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Iwatsuki | Japan, Belgium, Vietnam, China, United States |
| 岩月 | China |
| shizue iwatsuki Japanese poet who immigrated to the US with her husband and children (b. 1897) |
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| iwatsuki shuji Japanese politician (1918-2005) (b. 1918) |
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| masato iwatsuki researcher |
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| keiji iwatsuki researcher |
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| masaaki iwatsuki researcher (ORCID 0000-0002-0886-4618) |
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| kiyoko iwatsuki-horimoto researcher |
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| takehiro iwatsuki researcher |
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| shunzaburo iwatsuki researcher |
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| kiyoko iwatsuki-horimoto |
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