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.
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.
Hestia is the Greek name for a Greek goddess.
Greek Goddess
The Greek goddess Gaea was identified with the Roman goddess Terra.
Gaea was the goddess of the Earth in Greek Mythology
Last names are really never mentioned in mythology. (Including Homer's works)The Greek goddess had only that one name.