法華經義記 1.64

1.64

「離波多」者，此間言星宿比丘，其母無兒，恒拜求星神，後得有子，既不達業行，謂為星惠，故言星宿，亦言假合身也。

"Revata" is called here the "constellation monk". His mother had no sons and constantly prayed to the constellation deities. Later she obtained a son, and not understanding karmic actions, thought it was a gift from the constellations; hence he is called "Constellation", and is also called "the temporarily conjoined body".