Cognomen จริงจัง (Serly 
, Chingchang 
, จริงจัง ) , all around the world, is quite a rare last name. The cognomen จริงจัง is characteristic of Indonesia, where it is a rare surname, Hungary, and Honduras. Not in comparison with a country's population, the name is most common in Indonesia, Hungary, and Saudi Arabia. More frequently, จริงจัง is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Serly | Brazil, Indonesia, Philippines, Lebanon, Democratic Republic of the Congo |
| Chingchang | Thailand, Canada, United States, Taiwan, India |
| จริงจัง, Verhust | Thailand |