Wdyto Eire?
Dh suggested this just a little bit ago for a future daughter (and not Eira, but thanks in advance for the suggestion).
I don't like any of the other Eir* names in three db, either (except for Eirlys, but dh made it clear he liEirE).
I'm leaning toward a possible double fn with it, though (which he surprisingly IS ok with).
If I had to choose right now, I'd pick Lamb for the second name. My aunt's name is Rachel, her favorite animal is a lamb, and I like the Lamb of God reference.
The only other second names I've come up with so far are Hope and Lily.
So, Wdyt?