Sultanpur is named after Chauhan Rajput raja Sultan Singh Chauhan, a great grandson of Harsh Dev Singh Chauhan. Harsh was one of 21 sons of king Sangat Singh Chauhan. Raja Sangat Singh was a great-grandnephew of king Prithviraj Chauhan (reign. c. 1178–1192 CE ) according to historical recorded by British raj Indian civil servant and historian Henry Elliot (1817-1907). Raja Sultan Singh Chauhan established Sultanpur in 1474 Vikram Samwat (1417 or 1418 CE) after wresting it from Silar Muslims. Silar Muslims, a branch of Oghuz Turks, originated from the invader Mahmud of Ghazni's (971 – 1030 CE) nephew Ghazi Saiyyad Salar Masud (1014 – 1034 CE) buried in Bahraich in Uttar Pradesh. Sultanpur was the biggest village (covering 52000 bighas of land) under Farrukhnagar and many of the present day villages around it have originated as dhanis i.e. temporary farmer's shelters within the "lal dora" revenue boundary of Sultanpur.