Throughout the world, Eisaku (Eisaku 
) is a very rare boy's given name. The first name Eisaku is characteristic of Eastern Asia, particularly Japan, where it is a very rare boy's name, and China, where it is an extremely rare masculine name. More prevalently, Eisaku is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Eisaku | Japan, China, Singapore, United States, Brazil |
| eisaku sawada (b. 1933) |
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| eisaku tanaka (b. 1933) |
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| eisaku hokazono researcher |
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| eisaku okada researcher |
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| eisaku iwanaga researcher |
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| eisaku ogawa researcher |
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| eisaku oho researcher (ORCID 0000-0002-4770-8503) |
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| eisaku nishida researcher |
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| eisaku ito researcher (ORCID 0000-0001-8692-1350) |
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| eisaku kondo researcher (ORCID 0000-0002-2939-036X) |
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| eisaku yoden researcher |
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| eisaku ito researcher ORCID 0000-0002-8470-7016 |
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| eisaku fujimoto researcher |
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| eisaku miyauchi researcher (ORCID 0000-0002-6837-6392) |
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| eisaku kawanami |
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