Phaethusa (Φαέθουσα) is the Greek name from phaethon ("radiant"). One of the Heliades — sisters of Phaethon — who wept so bitterly when their brother was struck down by Zeus that they were transformed into poplar trees, their tears becoming amber.
Rare but iconic in Ovid's Metamorphoses.
Phaethusa reduces to eight — the number of Greek amber-tears.