Gérard was born in Paris, France to an Armenian father and an Italian mother, but grew up mainly in Rio de Janeiro, in Brazil. In 1953, he returned to Paris and became a choir boy at Notre Dame. Following this he played in the rock and roll band The Dangers. In 1958 he made his first recordings: "Viens" (a cover of the Kalin Twins' hit "When") and "D'où reviens-tu Billy Boy" (adapted from Dorothy Collins' "Where Have You Been, Billy Boy"), making one of the first young French singers to successfully sing rock and roll (his only rivals at this stage were Richard Anthony, Claude Piron (later better known as Danny Boy) and Gabriel Dalar), although his commercial impact was very limited; despite a latter-day, revisionist recasting of him as the French Elvis Presley, he was nevertheless one of France's first rock stars.