English and Danish: topographic name for someone who lived by a
thorn bush or hedge (Old English, Old Norse þorn). The name
is also found in Sweden.
English: habitational name from a
place named with Old English, Old Norse þorn ‘thorn bush’
(see 1), for example Thorne in Kent, Somerset, and South Yorkshire.
North German and Danish: topographic name for someone who
lived near a tower, from Middle Low German torn
‘tower’.
German: habitational name from the city of Thorn
(Torun in Poland), which was named with Middle High German
torn ‘tower’.
Dictionary of American Family Names, Oxford University Press, ISBN 0-19-508137-4
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