'Clan' Gunn origin
Ptolemy's map issues and the proto-Gunn name, refined and revisited -
1) Above is the Blau map with clear definition of what is accepted as being Dunnet Head and Noss Head.
2) Around Dunnet Head we have the Kournaovioi / Cornavii. Skene in 1836 gives their area as being Strathnaver and Kaithness.
So we have Courns / Kourns living in the first century in what is now viewed as the Gunn area.... The similarity in sound of the names is, at the very least, of interest as a possible origin for the name Gunn as we now have it...
Etymology? Possibly 'people of the horn' - consider the coastline. And consider the possible origin of Cornwall...