Gaina or Gainan is a gotra (clan) of Jats found in District Ajmer and Bharatpur in Rajasthan, India. Gaina Jats are also found in Marwar region of Rajasthan. They were rulers of some republics in Didwana area in Nagaur. Probably a group of Johiya Jats was known as Gaina. There is a village called Bardu in Didwana area in which a marble stone inscription bears a portrait of Jat chieftain named Kisna Ram Gaina, who has been shown carrying weapons side by side of statue of his wife Sati Rani. This inscription bears date as chaitra badi 6 samvat 1814 (1757 AD).