Family name อุทัยรัตน์ (อุทัยรัตน์ 
, Uthairat 
, Utairat ) , all around the world, is quite a rare last name. The cognomen อุทัยรัตน์ is characteristic of Thailand, where it is quite a rare surname, Albania, and the United States, where it is an extremely rare surname. Likewise, อุทัยรัตน์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Uthairath, อุทัยรัตน์, Utairat | Thailand |
| Uthairat | United States, Thailand, Albania |
Eurutairat, Euthairarth, Outhairat, Utairath, Uthaiat, Uthairathana, Uthairutana, Uthaitirat, Uthayarat, and Uthayarata
| ภาณุ อุทัยรัตน์ Thai politician, TH (b. 1956) |
|