German: from a short form of the personal name Jodocus,
which is either a Latinized form of a Breton name, Iodoc, borne
by a 7th-century Breton saint (compare Jost and Joyce)
or from a reduced form of the personal name Augustus.
Eastern German: probably from Slavic gost ‘stranger’,
‘guest’, hence a nickname like Gast.
Dictionary of American Family Names, Oxford University Press, ISBN 0-19-508137-4
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