Last name origins & meanings:
- English: habitational name from Thornborough in North Yorkshire
(Thornebergh in 12th-century records) or Thornbrough in
Northumberland and North Yorkshire (T(h)orneburg in
13th-century records). The former is probably so named from Old
English þorn ‘thorn bush’ + beorg ‘hill’; the latter
from þorn + burh ‘fort’. Other possible though less
likely sources are Thornbury in Devon, Gloucestershire, or
Herefordshire, which are all named from Old English þorn +
byrig, dative of burh ‘fortified place’.
- Possibly an Americanized spelling of Swedish Thornberg.
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