法華義疏 1.239

1.239

「須菩提」者，此云空生，以是生時諸物皆空，相師云：「此兒必解空第一」，故名空生，亦云善吉。舍衛國有長者名拘留，無兒乞天神得之，後長大請佛出家，因隨佛往祇洹精舍作比丘。

"Subhūti" is translated here as "Born of Emptiness" (Kōngshēng). Because at the time of his birth all things became empty, a physiognomist said, "This boy will surely be foremost in understanding emptiness," so he was named "Born of Emptiness"; he is also called "Auspicious Goodness" (Shànjí). In the country of Śrāvastī there was an elder named Kuryu (Kulya) who had no son, prayed to heavenly deities, and obtained him. Later, having grown up, he requested the Buddha to let him leave the household life, and following the Buddha to the Jetavana monastery, he became a monk.