Last name Sadao (Sadao 
, サダオ , Садао 
) , worldwide, is quite a common cognomen. The surname Sadao is habitual in Japan, where it is quite a rare surname, Philippines, where it is a rare surname, and Thailand. Measured by absolute frequency, it is the most numerous in Japan, Philippines, and China. Very seldom, Sadao is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sadao | Philippines, Brazil, Japan, Thailand, China |
| サダオ | Japan |
| Садао | Russia |
| amy sadao art institution director, writer, juror, and lecturer., US (b. 1971) |
|