Cahill was educated at Callan Christian Boys School and studied to become a teacher at Ring College in Dungarvan, Ireland and received the school's Gold Ring Award, granted only to student who could speak, read and write Gaelic.
Cahill's educational background at Callan Christian Boys School and his studies at Ring College in Dungarvan, Ireland, were marked by his achievement of the school's Gold Ring Award, a recognition of his mastery of Gaelic language skills.