Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
DOON
As described in historical dictionaries
Patronymica Britannica (1860)
DOON. 1. A-Sax. dun, a hill. 2. A ' bonny ' river with ' banks and braes,' in Ayrshire.