Luna was the Roman goddess of the moon, hence the use of her name to describe the moon (lunar eclipse etc)
The scientific name for a Luna Moth is Actias luna.
Well, her real name is Lily Luna Potter. Why would she have any other "real" name? It is stated in the Epilogue that her name is Lily Potter - I'm not sure if her middle name is mentioned, but it is for sure her name!
Luna Schweiger's birth name is Luna Marie Schweiger.
Ailyn Luna's birth name is Ma. Ailyn Luna.
Aitor Luna's birth name is Aitor Gonzlez Luna.
BarBara Luna's birth name is Barbara Ann Luna.
Drew Luna's birth name is Andrew Blake Luna.
Gustavo Luna's birth name is Gustavo Luna Noguera.
Pauleen Luna's birth name is Marie Pauleen Luna.
Ricky Luna's birth name is Luna, Jos Enrique.
Vicente Luna's birth name is Vicente Martin Luna.
Bigas Luna's birth name is Josep Joan Bigas Luna.