Shilōach (שִׁלֹחַ) means a sending forth (of water) — the name of the gentle aqueduct and pool in Jerusalem. From shālach (to send). Same as NT Siloam (John 9:7).
Isaiah 8:6: 'Because this people has rejected the gently flowing waters of Shiloah and rejoices over Rezin and the son of Remaliah...' Judah preferred military alliances over God's quiet provision. The waters of Shiloah — gentle, modest, life-sustaining — represent God's unspectacular but faithful care. In contrast, God would bring the mighty Euphrates (Assyria) flooding over them. John 9:7: Jesus sends the blind man to wash in the Pool of Siloam ('Sent'), connecting healing to this ancient symbol of God's sending.