ðɪ ˈɑːksfɚd dˈɪkʃənˌɛɹi ʌv plˈeɪs nˈeɪmz hɐz wˈɜːθ æz mˈiːnɪŋ ɐn ɛŋklˈoʊʒɚ, hˈɛns ɛŋklˈoʊʒɚɹ əvə mˈæn kˈɔːld hˈɛpə.
The Oxford Dictionary of Place Names has –worth as meaning an enclosure, hence enclosure of a man called Heppa.