English: from a Middle English personal name Clac, which is
from Old English Clacc or the Old Norse cognate
Klakkr. As a personal name this is from a word meaning ‘lump’
and may have been used as a nickname for a large or thickset man.
Reaney suggests that it could also be from clacker ‘chatterer’.
Dictionary of American Family Names, Oxford University Press, ISBN 0-19-508137-4
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