Why does luna mean the moon?

Because luna is the goddess of the moon in Roman mythology, in Roman tradition, she is usually worshipped with Sol, Rome's own sun god, so luna means the moon.

Because the Romans liked to use Roman gods to annex foreign gods with similar clergy, luna also annexed the Greek moon goddess Selene. Because of the annexation of Greek gods, Rome later thought that luna and Saul were brother and sister.

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Her main story is her sad love with Endymion. It is said that a handsome young shepherd named Endymion won the favor of the goddess.

However, the love between her and mortals is not accepted by the gods, because Chang 'e must keep herself as jade in order to perform her duties well. Therefore, Jupiter asked Endymion to choose between death and a deep sleep of eternal youth. Endymion finally chose the latter for love.

So every night, luna came to the cave where he slept and kissed him on the cheek. Finally, she gave birth to fifty daughters for the sake of her beloved life.