Family name คนธรรมดา (คนธรรมดา 
, Plainer 
, Normalman ) , in all the world, is a rare last name. The surname คนธรรมดา is characteristic of Austria, where it is quite a rare surname, Thailand, where it is a very rare surname, and the United Kingdom. Measured by absolute frequency, the name is most common in Austria, the United States, and Thailand. Very seldom, คนธรรมดา is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Normalman, คนธรรมดา | Thailand |
| Plainer | United Kingdom, Austria, Germany, Thailand, United States |
| Simpleboy | Nigeria |