English: The personal heraldry of Archbishop Coyne, upon a blue (azure) field, is Archbishop Coyne’s coat of arms which blends images representing his love for God, family genealogy and ministry history in the Archdiocese of Boston.

Archbishop Coyne’s grandfathers were Irish and his grandmothers were French. The coat of arms reflects those two heritages with the Celtic cross and the fleur de lis. The Celtic cross also calls to mind the centrality of the cross in the history of salvation and the sacrifice of Jesus which brings redemption. The fleur de lis also represent Mary, the Mother of our Savior, and Saint Joseph, her most chaste spouse. Finally, the blue (azure) field also calls to mind Mary, the Immaculate Conception, under whose patronage the United States of America has been placed.

Source: https://archdioceseofhartford.org/coadjutor-archbishop-christopher-j-coyne/