Due to have a second girl in a month. We’ve decided on the middle name [name]Kira[/name], but we’re stuck on the first name. We are trying to decide between the following:
[name]Selena[/name]
[name]Autumn[/name]
[name]Willow[/name]
Note: Our first child is named [name]Sophie[/name].
I prefer [name]Willow[/name] with [name]Sophie[/name], [name]Willow[/name] [name]Kira[/name] is sweet.
I like all three. [name]Willow[/name] and [name]Autumn[/name] on our name list and [name]Selena/name is my middle name. 
I vote for [name]Autumn[/name] since you are due in the fall. [name]Willow[/name] is getting popular and [name]Selena[/name] would start an S theme. In all honesty you can’t go wrong with any of them.
1 [name]Willow[/name] [name]Kira[/name]
2 [name]Autumn[/name] [name]Kira[/name]
3 [name]Selena[/name] [name]Kira[/name]
All three are striking but none work optimally well with [name]Kira[/name]. [name]Kira[/name] would work best with a longer first name (one with three syllables), so [name]Selena[/name] is the best bet. However, the two -a sounds at the end repeat each other, which can make the name seem rhyme-y. [name]Autumn[/name] and [name]Willow[/name] are both two syllables and so saying “[name]Autumn[/name] [name]Kira[/name]” aloud can sound a bit choppy.
Are you willing to switch them around? Because [name]Kira[/name] [name]Selene[/name] / [name]Celine[/name] has perfect flow, and is very striking.
I adore [name]Sophie[/name] and [name]Willow[/name] together, [name]Willow[/name] [name]Kira[/name] sounds nice enough. [name]Autumn[/name] [name]Kira[/name] is lovely too.