Cognomen Tadakazu (Tadakazu 
) , all over the world, is a rare surname. The surname Tadakazu is characteristic of Eastern Asia, particularly Japan, where it is a rare surname, and China, where it is an extremely rare surname. Likewise, Tadakazu is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Tadakazu | Brazil, Japan, United States, Thailand, China |