I hink mentioned before that there were 3 Colvyles (or similar spelling) on the ragman's roll for Ayrshire. From memory an Adam and two Thomas'. These are plausible Caldwell names but whether they are Norman Colvilles or Scots Caldwell's in Norman French transcription I don't know. I have also lost the original reference to this fact.
I do know that Strawhorn's "Ayrhire he story of a county" AANHS 1975 page 23 says "For Kings Kyle, gants were made by the king himself to lesser barons who owed direct allegiance to the crown. We have references only to Philip de Colville (Ochiltree) and Thomas Colville le Scot (Dalmellingon)."
The scribes seen to have felt it necessary to differentiate one Colville from the other by appending "le Scot" to the second. If he was Scots perhaps the other was of Norman descent. Caldwell is hard enough to pronounce for a lallans speaking Scot let alone a scribe who still dealt in French. Perhaps the Thomas of Dalmellington was indeed a native Scot who was also a Caldwell an had the misfortune of having his name translated to the closest approximation that the French-speaking Scribes of the day had knowledge of.
By the way - for the fans of William of Straiton - Dalmellington is very close to Straiton.
Perhaps the ragman's roll is on the "web" somewhere and someone can guide us there for a full listing.