Family name ถนอมจิตร (ถนอมจิตร 
, Thanomchit 
, Thanomjit 
) , worldwide, is a rare last name. The surname ถนอมจิตร is characteristic of Laos, where it is quite a rare surname, Thailand, and the United States, where it is an extremely rare surname. More frequently, ถนอมจิตร is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Thanomjitr, ถนอมจิตร | Thailand |
| Thanomchit | Canada, Thailand, France, Laos, United States |
| Thanomjit | Norway, Thailand, United States, United Kingdom |
Tanomchit, Tanomchitr, Tanomjita, Tanoomjit, Tanormchit, Tanormjit, and Thanomcjit