Family name ถนอมจิตต์ (ถนอมจิตต์ 
, Thanomjit 
, Tanomjit ) , around the world, is a rare last name. The surname ถนอมจิตต์ is habitual in Thailand, where it is a rare surname, the United Kingdom, where it is an extremely rare surname, and the United States. More frequently, ถนอมจิตต์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| ถนอมจิตต์ | Thailand |
| Thanomjit | Norway, Thailand, United States, United Kingdom |
| Tanomjit | United Kingdom, Thailand, United States |