Meaning A girl's name of Finnish origin, it means "one of action." Origin of Sini Finnish , Scandinavian +-100%Zoom level changed to 1 Popular Middle Names Pronunciation 🔊 Listen Sini Similar Names Kerrttu Mijam Dejana Yevpraksiya Sari Sisu Sieva Siiri Stiina Suoma Year by Year Popularity of Sini