Family name origins & meanings
- 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).