The Clan began in the early 14th century with Donald, 3rd son of Robert Comyn and the grandson of the Comyn killed by the Bruce at Dumfries, married the daughter of the MacKintosh chief. The name of the Clan comes from their son, David. His family and followers being known as Clan Dhai as the name Comyn was proscribed around 1320.

The Davidsons were almost wiped out at the Battle of Inverhaven in 1370. They followed the MacKintoshes and others of Clan Chattan against the Camerons who had invaded Badenoch. A dispute arose between the Davidsons and MacPhersons over the right to command. When the MacKintoshes supported the Davidson side, the MacPhersons left the field.