| Jaakko | | | Gender: | Male | | Origin: | Finnish |
| | | | | Variant of Finnish Jaako, meaning "supplanter". |
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| Jaako | | | Gender: | Male | | Origin: | Finnish |
| | | | | Finnish form of Jacob, meaning "supplanter". |
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| Jaap | | | Gender: | Male | | Origin: | Dutch |
| | | | | Dutch pet form of Jacobus, meaning "supplanter". |
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| Jaasau | | | Gender: | Male | | Origin: | Hebrew |
| | | | | Hebrew biblical name of a descendant of Bani, meaning "they will do". |
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| Jabbar | | | Gender: | Male | | Origin: | Arabic |
| | | | | Arabic name meaning "powerful". |
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