Last name 恬矣 (恬矣 
) , in the world, is a very rare cognomen. The last name 恬矣 is habitual in Eastern Asia, particularly China, where it is an extremely rare surname. More prevalently, 恬矣 is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| 恬矣 | China |