法華義疏 1.371

1.371

「娑伽羅」者，有人言：從國立名，住在娑伽羅國，此國近仙人而住，王觸忤仙人，仙人呪此國令成海，此龍居住其中，從本國立名也。有人言：娑伽羅，海名也。

Regarding “Sāgara”: some say his name is taken from a country; he dwelt in the country of Sāgara. This country was situated near a ṛṣi; the king offended the ṛṣi, and the ṛṣi cursed the country, causing it to become an ocean. This dragon resided within it and took his name from his original country. Others say that Sāgara is the name of the ocean.