Meaning Commonly used in Irish and a variation of Rose. It means 'horse', 'fame' and 'rose'. Origin of Roisin Celtic , Irish Popular Middle Names Sumalee, Una Pronunciation 🔊 Listen Roisin ROI-sin Similar Names Ruby May Eva Evelynne Bethany-Louise Lily May Mia Louise Molly May Caitlinn Eleanore Summayyah Year by Year Popularity of Roisin