Leod was the eponymous ancestor and founder of Clan MacLeod and Clan MacLeod of Lewis. Almost nothing is known about him and he does not appear in any contemporary records. Tradition dating to the late 18th century made him a son of Olaf the Black who was King of Man. Heraldic evidence, dating to the late 17th century, is considered to be the earliest evidence of descent from Olaf the Black. However, in recent years, this traditional lineage has been challenged and is no longer considered fact by one historian.

Clan MacLeod is a Highland Scottish clan associated with the Isle of Skye. There are two main branches of the clan: the MacLeods of Harris and Dunvegan, whose chief is MacLeod of MacLeod, who are known in Gaelic as Sìol Tormoid ; the Clan MacLeod of Lewis and Raasay, whose chief is MacLeod of The Lewes, are known in Gaelic as Sìol Torcaill. Both branches claim descent from Leòd, a Norse-Gael who lived in the 13th century.