Euphrosyne

This was Saint Catherine of Siena's childhood nickname, so if you're a Euphrosyne you have at least two possible saint namesakes.

There is a Russian saint named St. Euphrosyne. She is commemorated on September 25.

Marie Spartali Stillman (1844-1927), the Pre-Raphaelite painter, was born Marie Euphrosyne Spartali. Her mother was named Euphrosyne, called "Effie", and Marie named her only daughter Euphrosyne "Effie". From Wikipedia: "Marie and her cousins Maria Zambaco and Aglaia Coronio were known collectively among friends as 'the Three Graces', after the Charites of Greek mythology (Aglaia, Euphrosyne and Thalia), as all three were noted beauties of Greek heritage."