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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Related and similar surnamesFoley
The Folly surname in historical dictionaries
Patronymica Britannica (1860)
FOLLY. "Any ridiculous buildino-, not answering its intended purpose." Halliwell. Most counties have many spots so called ; but I do not find Mr. Haiiiwell's deiluition always correct. I should prefer calling a " folly," a temporary or fragile building, and that seems to liave been the sense of the Norman -French p. In the Roman de Ron of Master Wace, line 12, 136 we read —