Hastings' Dictionary of the Bible (1898)
EN-HAD'DAH (swift fountain), a place in Issachar. Josh 19:21. Van de Velde and Thomson suggest as its site 'Ain Haud, on the western slope of Mount Carmel, 2 miles from the sea. Grove questions this view. Conder proposes Kefr 'Adan. EN-HAK'KORE (fountain of the crier), a spring opened for Samson. Jud 15:19. Milton refers to it in Samson Agonistes: "Samson's Spring" was pointed out on the way from Sochoh to Eleutheropolis from the time of Jerome to the fourteenth century, but Robinson rejects this site; Van de Velde suggests a large spring near Tell el-Lekiyeh, 4 miles from Beer-sheba.
This, however, is 30 miles from Gaza, while Samson's exploit was probably much nearer that city. Conder found near Zoreah a spring called 'Ayun Kara, which name seemed to resemble En-hakkore.
Hitchcock's Bible Names (1869)
quick sight; well of gladness
Schaff's Bible Dictionary
EN-HAD'DAH (swift fountain), a place in Issachar. Josh 19:21. Van de Velde and Thomson suggest as its site 'Ain Haud, on the western slope of Mount Carmel, 2 miles from the sea. Grove questions this view. Conder proposes Kefr 'Adan.