In Greek mythology, Euphrosyne (Ευφροσύνη) was one of the Charites, known in English also as the "Three Graces". Her best remembered representation in English is in Milton's poem of the active, joyful life, "L'Allegro". She is also the Goddess of Joy, a daughter of Zeus and Eurynome, and the incarnation of grace and beauty. Also known as the goddess of Mirth. The other two Charites are Thalia (Good Cheer) and Aglaea (Beauty or Splendor).
The asteroid "31 Euphrosyne" is named after the goddess. In Modern Greek, the name is usually pronounced e-fro-SI-ni.