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 Culpeper surname in historical dictionaries
Patronymica Britannica (1860)
CULPEPER. CULPEPYR. This family, who were eminent in Kent aud Sussex fi"om the XIII. to the XVIII. century, were so numerous and influential that Camden notes, in hisRemaiues, the remarkable fact, that, " at one time there were twelve Knights aud Baronets alive of this house together." The Barons Colepeper, extinct in 1752, were a branch. Strange as it may appear, I believe that in the counties above mentioned the name is entirely extinct, and in other parts of England it is A'ery rarely met with. Tlie etymology of the word puzzles me. If it might be taken literally, (CuU-iJcpper), it was an excellent name for the celebrated herbalist, Nic. Culpeper, who was of this family.