Ethlyn \e-thl-yn, eth-lyn\ as a girl's name is a variant of Ethel (Old English), and the meaning of Ethlyn is "noble". The baby name Ethlyn sounds like Ethlynn, Ethlin and Ethelyn. Other similar baby names are Edlyn, Elyn, Ellyn, Emlyn, Emelyn, Emblyn, Emalyn, Ethyl, Ethelin, Evlyn, Evelyn, Evilyn, Evalyn and Kathlyn.