I wonder if Luna is such a common transfem name due to the allegorical nature that the Moon has in many cultures
Consider the Japanese tale of Kaguya (as opposed to the Japanese anime of Kaguya-sama), the Chinese tale of Chang’e, or the Aesop fable of “The Moon and Her Mother”. The Moon is so strongly associated with women, more so than the Sun is.
I think the Moon in many cultures has such a strong allure, so strong that as a civilisation we succeeded in visiting it.
The Moon has always represented femininity, but it has represented power and attraction (see: the tides), and not to mention that it has occult and witchcraft symbolism too, a source of strength and power.
So I think it makes a lot of sense to call yourself Luna… You are drawing on thousands, if not millions of years of folklore, history, and spirit.
A name is symbolic, and it is even more symbolic when you chose it for yourself… All names have some kind of meaning
I don’t think it is a cliche to call yourself Luna — just because it is common does not invalidate the journey you went through to pick it
But just know that you are as the Moon is; so beautiful