Kevin Barry Moore was born on 23 May 1955 in Newbridge, County Kildare, Ireland. His parents were Andy Moore and Nancy Power, who had already raised three daughters and two other sons. Moore attended a Patrician Brothers primary school and later studied at Newbridge College, run by the Dominican Order. In college he formed the group Aes Triplex with his brother Andy and a school friend. He later attended a college in Limerick, but he dropped out after a couple of years to pursue a music career.