What name in your opinion flows the most with [name_f]Elena[/name_f].
Our choises have been short and sweet.
[name_f]Gwen[/name_f]
[name_f]Lily[/name_f]
[name_f]Brynn[/name_f]
[name_f]Rosie[/name_f]
[name_u]Elia[/name_u]
Of course if you have a name that isnt on our list, please do suggest it, we are all open for suggestions!
I love [name_f]Lily[/name_f] and [name_f]Elena[/name_f]! Both names are very feminine and pretty and complement each other well.
I also love the idea of sisters named [name_f]Anna[/name_f] & [name_f]Elena[/name_f] or [name_f]Elena[/name_f] & [name_f]Maria[/name_f]. [name_f]Hope[/name_f] this helps!
[name_f]Lily[/name_f] is best match imo. Both in style and popularity.
[name_u]Elia[/name_u] is definitely too matchy with [name_f]Elena[/name_f]. Other than that - all names could work. I strongly prefer [name_f]Lily[/name_f], and like [name_f]Rosie[/name_f] & [name_f]Elena[/name_f] as well.
I really like [name_f]Elena[/name_f] and [name_f]Gwen[/name_f], but I think [name_f]Lily[/name_f] works nicely as well.
[name_f]Lily[/name_f] and [name_f]Gwen[/name_f] are my favorites with [name_f]Elena[/name_f]! I think [name_f]Elena[/name_f] & [name_f]Rosa[/name_f] (w/ nickname Rosie) would be stunning too. Good luck 
I like [name_f]Lily[/name_f] best with [name_f]Elena[/name_f]! I agree with pp that [name_u]Elia[/name_u] is rather close to [name_f]Elena[/name_f], which might lead to confusion, and imo [name_f]Rosie[/name_f], [name_f]Brynn[/name_f] and [name_f]Gwen[/name_f] have a very different vibe than [name_f]Elena[/name_f] does (although I looove [name_f]Rosie[/name_f]!). I’d love to see something a little more feminine and elaborate with [name_f]Elena[/name_f]… inspired by [name_f]Lily[/name_f], [name_f]Rosie[/name_f] and [name_f]Gwen[/name_f]; what do you think of [name_f]Lilia[/name_f], [name_f]Rosalie[/name_f] or [name_f]Genevieve[/name_f] with [name_f]Elena[/name_f]?
I like [name_f]Gwen[/name_f] and [name_f]Rosie[/name_f] (but prefer [name_f]Rose[/name_f] or [name_f]Rosa[/name_f] as full name).
Other suggestions:
[name_f]Bianca[/name_f]
[name_f]Clara[/name_f]
[name_f]Eva[/name_f]
[name_f]Flora[/name_f]
[name_f]Juliana[/name_f]
[name_f]Lucia[/name_f]
[name_f]Sylvia[/name_f]
[name_f]Lily[/name_f] and [name_f]Elena[/name_f] or [name_f]Rosie[/name_f] and [name_f]Elena[/name_f] works best in my opinion! I love those flower names
[name_f]Lily[/name_f] or [name_f]Rosie[/name_f] seems to work best, although I’d suggest [name_f]Rosa[/name_f] nn [name_f]Rosie[/name_f] (or [name_f]Rosalie[/name_f]. [name_f]Elena[/name_f] and [name_f]Rosalie[/name_f] sound like sisters to me).
Both [name_f]Rosie[/name_f] and [name_f]Lily[/name_f] sound like sisters to [name_f]Elena[/name_f]! Both of them are so soft and sweet and pretty.
I also second the suggestion of [name_f]Sylvia[/name_f]!
[name_f]Elena[/name_f] and [name_f]Lily[/name_f] are lovely together. I also like [name_f]Rosie[/name_f]!
What about [name_f]Elena[/name_f] and…
[name_f]Adriana[/name_f]
[name_f]Anna[/name_f]
[name_f]Ariana[/name_f]
[name_f]Arabella[/name_f]
[name_f]Brenna[/name_f]
[name_f]Brianna[/name_f]
[name_f]Camilla[/name_f]
[name_f]Clara[/name_f]
[name_f]Emmeline[/name_f]
[name_f]Evangeline[/name_f]
[name_f]Larissa[/name_f]
[name_f]Layla[/name_f]
[name_f]Lola[/name_f]
[name_f]Maya[/name_f]
[name_f]Mila[/name_f]
[name_f]Mira[/name_f]
[name_f]Serena[/name_f]
[name_f]Valentina[/name_f]
Definitely [name_f]Lily[/name_f].