There always seems to be a lot of confusion between the pronunciation differences of Eireann, Erin, and Aaron. Eireann is pronounced ER-in (with "ER" sounding like air and "in" sounding like bin or pin). Erin is pronounced E-rin (with "E" sounding like bet or pet and "rin" sounding like bin or pin). Aaron is pronounced A-rin (with "A" sounding like bat or cat and "rin" sounding like bin or pin). This said, these pronunciations are based on a Northeastern American accent.