I wouldn’t go with [name_f]Elena[/name_f], [name_f]Alaia[/name_f] or [name_f]Leia[/name_f] - very tongue twister and almost the same names, especially with the nickname [name_f]Ella[/name_f].
Names with some harder consonances like [name_f]Freya[/name_f] or [name_f]Francesca[/name_f] would sound really nice.
Some other options with some similar sounds but a little more distinct: [name_f]Hazel[/name_f], [name_f]Violet[/name_f], [name_f]Camille[/name_f], [name_u]Reese[/name_u], [name_f]Beatrice[/name_f], [name_f]Noemi[/name_f], [name_f]Marisol[/name_f], [name_f]Penelope[/name_f], [name_u]Carmen[/name_u], [name_f]Kassandra[/name_f], Myrrine.
[name_f]Eliana[/name_f] is adorable! I voted for [name_f]Eliana[/name_f] [name_f]Francesca[/name_f] (my favorite) and [name_f]Eliana[/name_f] [name_f]Freya[/name_f].
[name_f]Alaia[/name_f], [name_f]Leia[/name_f], [name_f]Elena[/name_f] and [name_f]Alessia[/name_f] are beautiful names but they are very similar to [name_f]Eliana[/name_f]. The combinations sounds repetitive.
[name_f]Athena[/name_f] is an amazing name!
I agree with previous posters that [name_f]Elena[/name_f], [name_f]Alaia[/name_f], [name_f]Alessia[/name_f], and [name_f]Leia[/name_f] are all way too similar to [name_f]Eliana[/name_f] to use as a middle name! [name_f]Eliana[/name_f] [name_f]Francesca[/name_f] is a lovely Latin name.
[name_f]Francesca[/name_f] is pretty and the only option I would use. Because [name_f]Eliana[/name_f] is a softer name the strength of [name_f]Francesca[/name_f] really complements it. I think the others are too like sounding to the first name and it seems lost.
[name_f]Freya[/name_f], [name_f]Athena[/name_f] and [name_f]Francesca[/name_f] Is re the only ones that I think world, as the others are very close to [name_f]Eliana[/name_f]
I think [name_f]Eliana[/name_f] [name_f]Francesca[/name_f] sounds best. Some of the other names like [name_f]Elena[/name_f] don’t flow well with [name_f]Eliana[/name_f] (in my opinion) because of the repeated sounds.
I’d suggest names that are more consonant-heavy like:
[name_f]Eliana[/name_f] [name_f]Matilde[/name_f]
[name_f]Eliana[/name_f] [name_f]Patrizia[/name_f]
[name_f]Eliana[/name_f] [name_f]Beatrice[/name_f]/[name_f]Beatriz[/name_f]
[name_f]Eliana[/name_f] [name_f]Ginevra[/name_f]
[name_f]Eliana[/name_f] [name_f]Fiammetta[/name_f]
[name_f]Eliana[/name_f] [name_f]Vittoria[/name_f]
[name_f]Eliana[/name_f] Saveria
[name_f]Eliana[/name_f] [name_f]Letizia[/name_f]
[name_f]Eliana[/name_f] Salvatrice