The Orr surname is a surname which originated in Scotland and Ireland in the 9th and 10th century. It is an old norse surname and the clan Orr are decendants of ui imair who are decendants of Ivar the boneless who is known to be the son of Ragnar lothbrok. Ivar mum is known to be queen auslaug who's father was Sigurd the dragon slayer. The different variations of the Orr surname is Ivar, McIvar, Mcure, Ure and mcure. And may also be decendants of King alpin who was the king of Dal riata in the 8th century because Ivar probably had children with his daughter which began the ui imar dynasty.