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Dutch: from the epithet de jong ‘the young’, used as a means of distinguishing between two bearers of the same personal name, usually a son from his father.

(Dictionary of American Family Names, Oxford University Press)
http://www.ancestry.com/search/SurnamePage.aspx?sourcecode=13304&html=b&fn=&ln=de+jonge&submit.x=0&submit.y=0