Luna

noun /ˈlunə/

a) The name of Earths moon.

- - - and it so happened, that in one of old Bryans daughters named Luna, or more familiarly Loony, he perceived, or thought he perceived, some imaginary similarity in form and air to the lovely apparition.

b) The Roman name of the Greek goddess of the moon, Selene.

A few seconds later, Luna Lovegood emerged, trailing behind the rest of the class, a smudge of earth on her nose, and her hair tied in a knot on the top of her head.