Meaning Rosmerta is a girls name of Celtic origin, it means a Goddes of fertility and abundance. Origin of Rosmerta Celtic , Irish Popular Middle Names Pronunciation 🔊 Listen Rosmerta ros-mer-ta Similar Names Arieen Berget Arleigh Tamane Kohar Kinfeosioluwa Mintha Afric Boudibiua Bellicent Year by Year Popularity of Rosmerta