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In all the world, Niwa (ニワ , Niwa
, 丹羽
, among others...) is quite a rare unisex first name. The first name Niwa is habitual in Indonesia, where it is a rare gender-neutral name, Tanzania, where it is a very rare female name, and Morocco, where it is a very rare male name. Not in comparison with a country's population, it is the most numerous in China, Indonesia, and India. Much less frequently, Niwa is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| ニワ | Japan |
| Niwa | Poland, Japan, Indonesia, United States, China |
| 丹羽 | China |
| Нива | Kazakhstan, Kyrgyzstan, Russia, Ukraine |