Meaning A boy's name of Welsh origin, it means "Legendary son of Eurosswydd Origin of Nissyen Welsh +-100%Zoom level changed to 1 Popular Middle Names Pronunciation 🔊 Listen Nissyen Similar Names Powell Naw Neb Nerth Nerthach Nynnyaw BwIch Elphin Eudav Gilvaethwy Year by Year Popularity of Nissyen