The name Alethea is a girl's name of Greek origin meaning "truth". Alethea and is often added to lists like Unique Baby Names: Unusual and Rare and discussed in our forums with posts like "Drop Your Favorite: GIRLS!".
From the experts:
Alethea, the name of the Greek goddess of truth, came into fashion in England in the 16th century, in tandem with the virtue names. Alethea may find new favor now as one of the goddess names stylish for baby girls.