Behindthename says:
LÍADAN
Gender: Feminine
Usage: Irish Pronounced: LEE-din
Means "grey lady" in Irish Gaelic. In Irish legend she was a poetess who became a nun, but then missed her lover Cuirithir so much that she died of grief.
another site said...
Líadan - (LYAH-dan) An Old Irish female name. Líadan was a
poetess, beloved by the poet Cuirithur, even though she was a nun. The mother of Saint Ciarán of Seir was also named Líadan. Legend has it that she conceived Ciarán after swallowing a star that had fallen into her mouth while she lay sleeping.
I've seen 3 pronunciations of it: Lee-din, Lyah-dan and Lee-a-din. What do you think?