[name_f]Do[/name_f] you prefer [name_f]Luna[/name_f] or [name_m]Luc[/name_m]ía (luh-sih-ah) for a girl “[name_f]Lu[/name_f]”? It is such a cute nn. Here in spain [name_m]Luc[/name_m]ía is very popular and means “light” [name_f]Luna[/name_f] is very pretty and it is the word for moon.
Also, do you think an [name_f]Eva[/name_f] [name_f]Luna[/name_f] could go by [name_f]Lu[/name_f]?
[name_f]Eva[/name_f] [name_f]Luna[/name_f] could go by [name_f]Eva[/name_f], [name_f]Luna[/name_f], both or [name_f]Lu[/name_f] right?
Also, sister would be [name_u]Pen[/name_u]élope
[name_f]Eva[/name_f] [name_f]Luna[/name_f] & [name_u]Pen[/name_u]élope is gorgeous
I think [name_f]Eva[/name_f] [name_f]Luna[/name_f] is very pretty. She could even be [name_f]Eva[/name_f] [name_u]Lou[/name_u] as a nn.
I think any other those could go by [name_f]Lu[/name_f].
I like both [name_f]Lucia[/name_f] and [name_f]Luna[/name_f] with nn [name_f]Lu[/name_f].
[name_f]Luna[/name_f] [name_f]Eve[/name_f] or [name_f]Lucia[/name_f] [name_f]Eve[/name_f] are nice combos.
[name_f]Lucia[/name_f] probably goes with [name_f]Penelope[/name_f] better 
I like [name_f]Eva[/name_f] [name_f]Luna[/name_f] too. Probably less likely to get the [name_f]Lu[/name_f] nickname. More likely to be [name_f]Eva[/name_f], [name_f]Eve[/name_f] or [name_f]Evie[/name_f].
I prefer [name_f]Luna[/name_f] “[name_f]Lu[/name_f]”, since that’s more unique where you live.
[name_f]Eva[/name_f] [name_f]Luna[/name_f] “[name_f]Lu[/name_f]” could work, but she might have to explain it to people whenever she introduces herself. If you’re okay with that, then go ahead and use it!