Arthur, William (1857) An Etymological Dictionary of Family and Christian Names. New York: Sheldon, Blakeman. 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 surnamesCommstock
The Comstock surname in historical dictionaries
An Etymological Dictionary of Family and Christian Names (1857)
(origin: Dutch.) From kom, a dock or harbor, and stock, a stick or timber--the wharf or dock of timber.