Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
We don't have any stats on how common this name is. This is probably because it's very rare in the UK.
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The Doon surname in historical dictionaries
Patronymica Britannica (1860)
DOON. 1. A-Sax. dun, a hill. 2. A ' bonny ' river with ' banks and braes,' in Ayrshire.