Jonathan, BROTHER, corresponding to the English John Bull, is the personification of the United States, especially of its native-born citizens. The original of the name is supposed to be Jonathan Trumbull (1710-85), governor of Connecticut, whose shrewdness, staunch patriotism, and unfaltering zeal gained him the esteem and friendship of Washington; and the latter's phrase when perplexed, 'Let us hear what Brother Jonathan says,' passed into a proverb.
Jonathan
Chambers's Encyclopaedia, Volume 6: Humber to Malta, p. 352
Source scan(s): p. 0367