Meaning A girl's name of Gaelic origin, it means "Bright." Origin of Allyn Gaelic , Irish +-100%Zoom level changed to 1 Popular Middle Names Edward Pronunciation 🔊 Listen Allyn Similar Names Aimil Aidana Ethne Siubhan Trina Diorbhall Eihhlin Giorsal Moibeal Sighle Year by Year Popularity of Allyn