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Last name origins & meanings:

  1. Scottish: habitational name from Buchanan, a place near Loch Lomond, perhaps named with Gaelic buth chanain ‘house of the canon’.
  2. The name Buchanan was brought independently to North America from Scotland by several different bearers in the 17th and 18th centuries. George Buchanan came to MD in 1698.

This name appears in the following lists: Literary Characters, U.S. Presidents