Family name セツコ (Setsuko 
, Setuko 
, セツコ ) , in all the world, is a common surname. The last name セツコ is habitual in Japan, where it is quite a common surname, Indonesia, where it is a very rare surname, and China, where it is an extremely rare surname. Also, セツコ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Setsuko | China, Brazil, Indonesia, United States, Japan |
| Setuko | Mexico, Brazil, Peru, United States, Japan |
| セツコ | Japan |