Perdita
“The lost maiden,” from the Latin perdere, to lose. In Shakespeare’s Winter’s Tale, the daughter of King Leontes.
While still a child she was disowned by her parents and set adrift to perish near the coast of Bohemia, where a shepherd rescued her and raised her as his daughter. Eventually, however, she was recognized and restored to her parents.
Percival
“From the valley which pierces (the mountains),” based on the French percer (to bore) and val (a valley); introduced, apparently, by Chretien de Troyes, French poet and author of Arthurian romances, in the 12th century.