There is also a Duncan tartan, called Duncan or Leslie of Wardis.  The Duncan name (which moved to Berwick by 1400) and Robertson's share the common ancestor, Stout Duncan.  The background is blue and green only, but with similar white and red over check.  Emerging at the same time as the Robertson Hunting in W & AK Johnson's "The Tartans of the Clans and Septs of Scotland", one might infer a common source (Atholl) for the Hunting Robertson and Duncan tartan as the "tartan for every name" dogma was fulfilled.