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 surnames
The Butterfly surname in historical dictionaries
Patronymica Britannica (1860)
BUTTERFLY. Berry mentions an armigerous family of this name, which is, of course, identical with the Fr. Papillon, now naturalized here.