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German, Dutch, Scandinavian, and Jewish (Ashkenazic): variant of Bayer.
German, Scandinavian, and Jewish (Ashkenazic): regional name for someone from Bavaria (German Bayern). This region of southern Germany derives its name from that of the Celtic tribe of the Boii who once inhabited this area. They were displaced in the 6th century ad by a Germanic people, the Boioarii or Baiuarii, whose name is derived from that of their Celtic predecessors.
[Dictionary of American Family Names, Oxford University Press]