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 Hoo surname in historical dictionaries
Patronymica Britannica (1860)
HOO.* The family of Thomas Hoc, created Lord Hoo and Hastings, who died in 1455, are said to have been derived from a Saxon source. It is certain that one Edrich de Ho was living contemporaneoysly with Archbishop Odo, the Conqueror's half-brother. The pedigree of the family, printed by W. D. Cooper, Esq., F.S.A., in Sussex Arch. Coll., vol. viii., p. 130, deduces them from Robert Hoo, of Hoo co. Kent, who died as early as the year 1000.