The name MacNab comes from the Gaelic Mac an Abu, meaning “the son of abbot”. This suggests, very strongly, that the founder of the Clan MacNab belonged to the clerical profession. It is believed that he was the Abbot of Glendochart.
During the 13th and 14th centuries, the MacNabs were a relatively large clan. They, along with the MacDougalls, opposed Robert the Bruce’s struggle for the Scottish crown.