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 Aguillon surname in historical dictionaries
Patronymica Britannica (1860)
AGUILLON. Banks says that Manser de Aguillon, the first of this family mentioned, lived temp. Richard I. They were a Norman race, and as the name is frequently spelt Aquilon it is probably a mere variation of Aquila, q.v.