Luna is the Latin word for the moon, and the name of the Roman goddess of the moon — counterpart to the Greek Selene. The Romans worshipped her as one of the heavenly bodies, alongside Sol (the sun) and Aurora (the dawn).
Until recently Luna was rare as a given name in the English-speaking world — too literal, perhaps, or too associated with the moth. That changed in the 2000s. Chrissy Teigen and John Legend named their daughter Luna in 2016; Penélope Cruz did the same; J.K. Rowling's Luna Lovegood gave the name a quirky-romantic appeal.
By 2020 Luna had entered the U.S. top 20 and shows every sign of staying there. Two syllables, soft sounds, a meaning every parent already loves.
Luna reduces to five in Pythagorean numerology — the number of change, curiosity, and gentle restlessness.