The Welsh and Scottish surname Mostyn is an habitational name from Mostyn in North Wales. This surname was adopted by a 16th-century Lord of Mostyn, Thomas ap Richard ap Hywel, and his brother Piers. The name was brought to Scotland in the 17th Century. 18th Century records of the name include Jane Mostyn, who married George Orr at Prestbury, on October 20th 1728. The Family Motto “ Auxilium meum a Domino” translates as “ My help is from God.”