From an English surname which was derived from place names meaning either "hay valley" or "hay hill", derived from Old English heg "hay" and denu "valley" or dun "hill". Hayden originates in Old English language and means "living in hay vale". Some sources also suggest that it might originate in Germanic languages and mean "heathen". Hayden can be used as both feminine and masculine given names, currently it is more popular for boys. It functions as a surname as well. It is also the name of several places in the United States.