DH and I can't agree. Please help.

[Georgi]

Lol, My sister has a Sienna & Tahlia.

I love Kira

[widdly]

I love Sienna

[The[cookie]Doctor]

I'd pick Kira over Sienna if you were against Kira for popularity. I know of much more Sienna's...
I also think Kira is nicer and I think 'Kira Mae' is beautiful.

[*Belle*]

I know quite a few Sienna's and only one Kira (spelt Keira). I love both the names. I would chose Kira. Sounds like you have the last same name as me!

[Bathsheba]

I've also heard of many more Sienna's than Kira's.

Kira is a nice name for a child... but I wonder how it would suit a mature woman?

[sneakysparkle]

How about Sierra?
Sort of a mix of Kira & Sienna, but a cute name in its own right

[The[cookie]Doctor]

How about Sierra?
Sort of a mix of Kira & Sienna, but a cute name in its own right

Very nice.

Bathsheba while you raise a valid point, your name is only what you make of it. If you would judge a woman with the name Kira as young and immature then that is certainly your loss.