Family name Iwanaga (Iwanaga 
, 岩永 ) , throughout the world, is quite a rare surname. The family name Iwanaga is habitual in Japan, where it is a rare surname, Singapore, and Brazil. In absolute terms, it most frequently occurs in Brazil, Japan, and the United States. Likewise, Iwanaga is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Iwanaga | United States, Japan, Brazil, China, Peru |
| 岩永 | China |
| jan iwanaga JP (b. 1550) |
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| yoshitaka iwanaga researcher |
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| kanako iwanaga researcher |
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| yasuhiro iwanaga researcher |
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| daigo iwanaga researcher |
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| eisaku iwanaga researcher |
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| tomoyuki iwanaga researcher (ORCID 0000-0003-1158-4403) |
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| takuya iwanaga researcher |
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| kenjiro iwanaga researcher |
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| masanobu iwanaga researcher |
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| shiroh iwanaga researcher (ORCID 0000-0002-4394-7267) |
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| midori iwanaga researcher |
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| kougoro iwanaga researcher |
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| joe iwanaga researcher |
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| takashi iwanaga researcher |
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