Amy of Garmoran also known as Amie MacRuari and Euphemia was a 14th-century Scottish noblewoman who was the sister of Raghnall mac Ruaidhri, Lord of Garmoran and the spouse of John of Islay. After her marriage had produced three sons, the ambitious John of Islay divorced her in order to remarry and cement his links with the House of Stewart. She then retired to her estates in the Highlands and Islands, and completed various ecclesiastical and other building projects. Her son Ranald was the progenitor of Clanranald.

Raghnall Mac Ruaidhrí was an eminent Scottish magnate and chief of Clann Ruaidhrí. Raghnall's father, Ruaidhrí Mac Ruaidhrí, appears to have been slain in 1318, at a time when Raghnall may have been under age. Ruaidhrí himself appears to have faced resistance over the Clann Ruaidhrí lordship from his sister, Cairistíona, wife of Donnchadh, a member of the comital family of Mar. Following Ruaidhrí's demise, there is evidence indicating that Cairistíona and her powerful confederates also posed a threat to the young Raghnall. Nevertheless, Raghnall eventually succeeded to his father, and first appears on record in 1337.