Diana is one goddess who ends in a. There may be more.
Athena
hera
Athena , goddess of Victory. [ AKA Pallas Athena ] .
Hestia
Goddess', because the word 'goddess' ends in 's'. (e.g. The goddess' name was Venus.) According to this site: grammargoddess.com both forms: Goddess' (modern usage) and Goddess's (traditional singular rule) are correct.
Artemis, Athena, Aphrodite, Amphitrite
in harvest moon ds/ds cute when u save her she ends up in the harvest goddess pond
Aphrodite (Venus) goddess of love ( Greek, Roman) and Astarte (Semetic reincarnation of Isis).
Athena, goddess of wisdom, arts and crafts, and war strategy, as well as Hera, goddess of marriage and wife of Zeus, therefore queen of the gods (also a major a-hole because she threw her son Hephaestus of mount Olympus because she thought he was ugly)
I don't believe there is a Greek god whose name has 9 letters and ends with a D. But Aphrodite, a Greek goddess, has 9 letters in her name.
Persephone is called both the goddess of spring for her yearly return to Earth/Demeter, and Queen of the Underworld as being the wife of Hades.
goddess