In Pure Land Buddhism, it is believed that when someone faithful dies, Guanyin is the one who places them in a lotus for rebirth in the Sukhavati heaven (pure land).
The original meaning of the name “Avalokitesvara” is not entirely certain, but it seems to have been “He who looks down upon the sounds.”
In this case, the sounds would refer to the cries of all sentient beings for help to escape from samsara, the cycle of endless earthly rebirth.