Family name อุ่นใจ (Aunjai 
, Unjai 
, Ounjai ) , all around the world, is quite a rare cognomen. The cognomen อุ่นใจ is habitual in South-eastern Asia, particularly Thailand, where it is quite a rare surname, Singapore, where it is a rare surname, and Malaysia, where it is a very rare surname. Much less frequently, อุ่นใจ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Aunjai | United States, United Kingdom, Thailand |
| Unjai | Norway, Singapore, Malaysia, Thailand, United States |
| Ounjai | United States, Thailand |
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