English: habitational name from places in Norfolk and Cumbria
named Colby, from the Old Norse personal name Koli (a byname
for a swarthy person, from kol ‘(char)coal’) + Old Norse
býr ‘settlement’.
Variant spelling of Norwegian
Kolby, a habitational name in Akershus, with the same etymology
as 1.
Dictionary of American Family Names, Oxford University Press, ISBN 0-19-508137-4
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