Loudin is a surname. It may originate in Scotland, where Loudin or Loudon are alternative spellings of Lothian, a place name.W.J. Watson, The Celtic Place-names of Scotland, 1926 repr. 1993, 101-2. Notable people with the surname include:
Forest Loudin (1890–1935), American football coach Frederick J. Loudin (1836–1904), American singer Vojtěch Loudín (born 1990), Czech skater
Maureen Loudin Loudon (name) Lowden (disambiguation)
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