English: nickname from Middle English thum ‘thumb’, for
someone with a missing or deformed thumb, or for someone of very small
size. Compare the folk tale of ‘Tom Thumb’.
German: from a short
form (of Slavic origin) of the personal name Thomas.
German: habitational name from places called Thum in Rhineland and
Saxony, or Thumen in Bavaria, or a topographic name from Middle High
German tuom ‘episcopal church’ (Dom).
Dictionary of American Family Names, Oxford University Press, ISBN 0-19-508137-4
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