Cognomen Chiyasu (千安 
, Chiyasu 
) , all over the world, is a very rare surname. The surname Chiyasu is habitual in Canada, where it is an extremely rare surname, and China. More prevalently, Chiyasu is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| 千安 | China |
| Chiyasu | Canada |