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Throughout the world, Iwanaga (Iwanaga
, 岩永
) is a rare mostly masculine, but infrequently female first name. The given name Iwanaga is characteristic of Eastern Asia, particularly China, where it is a very rare mostly boy's, but uncommonly feminine name. Also, Iwanaga is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Iwanaga | Peru, Brazil, Japan, United States, China |
| 岩永 | China |