Meaning A girl's name of Gaelic origin, it means "White Rose." Origin of Rhoswen Gaelic , Irish +-100%Zoom level changed to 1 Popular Middle Names Pronunciation 🔊 Listen Rhoswen Similar Names Roisin Ros Rosamond Rosamund Rosemarie Rosemary Rosy Ruby Rose Rosina Eva Rose Year by Year Popularity of Rhoswen