Dearman Family History

English: from a Middle English personal name Derman Dorman (Old English Dēormann) meaning either ‘beloved man’ (from dēore ‘dear beloved’) or ‘fierce spirited man’ (from dēor ‘wild creature’). See Dear.

Irish: shortened Anglicized form of Ó Duibhdhiorma ‘descendant of Duibhdhiorma’ a personal name meaning ‘black trooper’ see Dormer.

There has been some confusion with the more common personal name Diarmaid (see McDermott and compare Dearmond).

Probably an Americanized form of German Diermann or Thiermann which derive from short forms of the personal name Dietrich or perhaps from Middle High German tier ‘animal game’ + man ‘man’ and thus denote a game or venison dealer.