Finnish: ornamental name from koski ‘waterfall’,
‘rapids’. This was one of the many words denoting natural features
that were used in the formation of Finnish surnames during the name
conversion movement in the 19th and early 20th centuries. In the
U.S. this is sometimes a shortened form of other Finnish surnames
formed with this element, e.g. Kalliokoski, Ylikoski.
Polish: habitational name from any of several places called
Koski, named with kos ‘blackbird’.
Dictionary of American Family Names, Oxford University Press, ISBN 0-19-508137-4
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