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 Hornblower surname in historical dictionaries
Patronymica Britannica (1860)
HORNBLOWER. Cornage is a law term (Lat. conuujlwn for a species of tenure in grand serjeanty, " the service of which was to blow a horn when any invasion of the Scots was perceived; andby this tenure many persous held their lands northward, about the wall, commonly called the Plot's