The name Iain is a popular name and parents adore it due to its significance on the character. Iain name meaning is God is gracious ; in the bible , one of the apostles and it associate lucky number is 6. Iain is a versatile name that has been popular in the English-speaking world for many decades and Iain name meaning is also deep. Find out the pronunciation of Iain and other well-known baby names that sound similar to Iain in the United States of America (USA).