Freeborn \f-reebo-rn, fre(e)-born\ as a boy's name is of Old English origin. May date back to slave days, or to the era of widespread serfdom, when to be born free was worthy of commemoration.
For more information, see also the related name Freeman.
A baby name that sounds like Freeborn is Fairbairn. Other similar baby names are Deerborn, Raeborn and Sherborn.