首楞嚴義疏注經 4.548

4.548

跋難陀，云賢喜，與難陀龍常護摩伽陀國，雨澤以時，國無饑年。瓶沙王年設大會報龍之恩，人皆歡喜，從此得名。難陀，云歡喜，為目連所降。無耳而聽，未詳緣起。

Upananda is translated as "Worthy Joy." Together with the dragon Nanda, he constantly protected the realm of Magadha, providing seasonal rain so that the country suffered no years of famine. King Bimbisāra held a great assembly each year to repay the dragons' kindness, and all the people rejoiced; from this he received his name. Nanda is translated as "Joy," who was subdued by Maudgalyāyana. As for hearing without ears, the specific origin is not detailed.