Meaning A girl's name of Scottish origin, it means "cape; promontory." Origin of Rossalyn Scottish , Celtic Popular Middle Names Aileen, Moira Pronunciation 🔊 Listen Rossalyn Similar Names Camillei Stina Ronalda Regan Rosmerta Ragna Ragnfrid Ranveig Reidun Roønnaug Year by Year Popularity of Rossalyn