Surname วัฒนจักร (Watthachak 
, วัฒนจักร , Wattanak 
) , around the world, is an extremely rare last name. The last name วัฒนจักร is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Also, วัฒนจักร is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Watanaak, วัฒนจักร, Watthachak | Thailand |
| Wattanak | United States, Thailand |
Watanachak, and Watthajak