I don't think gods and goddessess had last names. If I had to guess, I'd say "goddess of wisdom." Athena, goddess of wisdom. That's probably her most common title, along with battle and crafts.
No, the Greek goddess Demeter does not have a last name, she does have titles and epithets.
The last name of Selene, the Greek goddess of the moon, is often referred to as "Luna" in Roman mythology. However, in Greek mythology, she is simply known as Selene, without a specific last name. She is commonly depicted as a beautiful woman driving a chariot across the night sky.
Aphrodite is a greek goddess of love.
The Greek name of the Greek goddess Athena is Athena. In Roman mythology the goddess Athena was associated with Minerva.
Eos is the name of Greek Titan goddess of the Dawn.
I believe the Greek Goddess's name is Gaia.
Isis is the Greek goddess of rainbows.
The name of the goddess is Artemis.
Greek Goddess
Gaea was the goddess of the Earth in Greek Mythology
The Greek goddess Gaea was identified with the Roman goddess Terra.
Last names are really never mentioned in mythology. (Including Homer's works)The Greek goddess had only that one name.