This ancient and distinguished name is of Anglo-Saxon and Old German origin; it is a hereditary surname developed from the male personal name Baldwin, which was popular in England before and after the Norman Conquest of 1066...
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This interesting name is of Anglo-Saxon origin, and has two possible sources. It can either be topographical, describing a "dweller by the top of a hill", from the Olde English pre 7th Century phrase, "bufan dune", meaning "above the hill"; or it may be locational from any of the places called Bowden or Bowdon. Bowden in Devonshire and Derbyshire, and Bowdon in Cheshire are composed of the Olde English elements "boga"...
Read more: http://www.surnamedb.com/Surname/Bolden#ixzz2ho4kUK5Q
More information on both surnames can be found at surnamedb.com which is free. They show variant spellings of Bolden that are close to Baldwin.