[name]Felicity[/name] [name]Lorelei[/name]
[name]Felicity[/name] [name]Iris[/name]
[name]Felicity[/name] [name]Cecelia[/name]
[name]Cecelia[/name] [name]Felicity[/name]
[name]Cecelia[/name] [name]Eloise[/name]
[name]Cecelia[/name] [name]Felicity[/name]. Best of both worlds.
Hmmmm… my favorite from your picks is definitely [name]Felicity[/name] [name]Iris[/name].
[name]Felicity[/name] [name]Iris[/name]! I adore [name]Felicity[/name]. [name]Cecelia[/name] [name]Felicity[/name] would be my second choice, but I much prefer the [name]Cecilia[/name] spelling.
Another vote for [name]Felicity[/name] [name]Iris[/name]. It gives me the happiest vibe of the five options, and I love the more energetic [name]Iris[/name] next to the lacier [name]Felicity[/name].
I don’t think [name]Cecelia[/name] [name]Felicity[/name] (or even [name]Felicity[/name] [name]Cecelia[/name]) flows that well. [name]Felicity[/name] [name]Iris[/name] is pretty.
Some suggestions
[name]Cecelia[/name] [name]Juliet[/name]
[name]Felicity[/name] [name]Lark[/name]
[name]Cecelia[/name] [name]Eleanor[/name]
[name]Felicity[/name] [name]Jane[/name]
[name]Felicity[/name] [name]Autumn[/name]
[name]Cecelia[/name] [name]Daisy[/name]
[name]Felicity[/name] [name]Aurora[/name]
[name]Felicity[/name] [name]Piper[/name]
[name]Cecelia[/name] [name]Piper[/name]
[name]Cecelia[/name] [name]Audrey[/name]
[name]Felicity[/name] [name]Cora[/name]
[name]Cecelia[/name] [name]Ruby[/name]
[name]Cecelia[/name] [name]Violet[/name]
[name]Felicity[/name] [name]Wren[/name]
[name]Cecelia[/name] [name]Faith[/name]
[name]Cecelia[/name] [name]Madeline[/name]
[name]Cecelia[/name] [name]Delphine[/name]
[name]Cecelia[/name] [name]Abigail[/name]
[name]Felicity[/name] [name]Savannah[/name]
[name]Felicity[/name] [name]Pearl[/name]
[name]Cecelia[/name] [name]Poppy[/name]
[name]Felicity[/name] [name]Hazel[/name]
[name]Felicity[/name] [name]Charlotte[/name]
Are any of these your style?
[name]Felicity[/name] [name]Iris[/name] is so happy and sweet
[name]Felicity[/name] [name]Iris[/name]!!
[name]Felicity[/name] [name]Iris[/name] gets my vote. [name]Both[/name] [name]Cecelia[/name] and [name]Felicity[/name] are amazing names, but [name]Felicity[/name] [name]Iris[/name] has a great flow along with the combined meaning ‘happy flower’.
[name]Just[/name] to add one more vote: [name]Felicity[/name] [name]Iris[/name]
[name]Felicity[/name] is my favourite first name out of the two-I don’t have a strong middle fave. 
I don’t know why, but [name]Felicity[/name] is one of those names I’ve never been able to get behind. It’s one of those names that I should like, but don’t. So, obviously, my preference is [name]Cecilia[/name] (which I adore), but I don’t love any of your combinations. Being objective, and putting aside my dislike of [name]Felicity[/name], I think the combination with best flow is [name]Felicity[/name] [name]Iris[/name].
[name]Felicity[/name] [name]Iris[/name] has the best flow. But my second favorite is [name]Cecelia[/name] [name]Eloise[/name].
Two beautiful names, I vote [name]Felicity[/name] [name]Cecelia[/name] (look at my signature and you’ll see why…)
I like [name]Felicity[/name] [name]Lorelei[/name] the best!
[name]Felicity[/name] [name]Iris[/name], definitely. The best of both worlds combos are quite a mouthful. [name]Felicity[/name] [name]Lorelei[/name] is nice, but perhaps a little dominated by Ls. [name]Love[/name] [name]Felicity[/name]!
I love [name]Felicity[/name] [name]Iris[/name], although [name]Felicity[/name] [name]Cecelia[/name] is nice too. If you choose [name]Cecelia[/name] as a first name, go with [name]Cecelia[/name] [name]Felicity[/name] for sure. [name]Cecelia[/name] [name]Eloise[/name] sounds like too many “E” sounds to me.
I like [name]Felicity[/name] I think paired with [name]Cecilia[/name] it’s way too much of a mouthful. [name]Felicity[/name] [name]Iris[/name] is fine if perhaps a little “s” heavy.
To me, [name]Felicity[/name] is very old fashioned in a bad way. Yes, it has the nn Lissy, which I like, but [name]Cecelia[/name] is old but a classic, and has the nn [name]Cece[/name] if she later wants something more modern. [name]Eloise[/name] is also pretty, so I would say [name]Cecelia[/name] [name]Eloise[/name].