Clair and Blair are both boy names, so even though you put on an e to make it girly, it still sounds like a boy. Ann, Suzette, Camille, other flower names, some gem names (but not Opal, it's just not that pretty a word) Lucy, Natalie, May, Marie, Rebecca, Elizabeth, these are girl names.  And my daughters are Jessie (boy name) Jade (new, ambiguous) Jo (that's all there is not JoAnn or anything) Jamie (also ambiguous) and Jenna--finally a girl!!!!

I wouldn't use it (cause it doesn't start with J :)  )I really have no room to talk about using boys' names for girls.  But I don't really like the name for a boy or a girl. No experience with anyone but Cece Shumway, and he was just some old man in town.  Why not Cecilia?  Simon & Garfunkle song?  That would make it not OK for me.  After I named my Jade, an R rated movie came out called Jade, or the main character was Jade and had low moral character.  Never saw the movie, but ick.  I still like her name, though.    And don't feel bad about the Clair Blair thing.  Most people have no idea that Ashley and Hilary are boys names too.   I tease my kids that if I had twins, girl & boy, I would name them DeBree and DeTritus.  Both those words mean garbage.  I would NEVER, of course, but it's fun to tease the kids.   I've heard of boys named Shirley, Marion (the o is the boy spelling), Vivian, and Francis (I forget if e is the girl spelling).   

I don't like the name Cecil at all, even for a boy,  sorry. In Britain, Claire is definitely a girl's name. 

I would go with Cecil Claire because at least it will clarify the name bearer is female. They (the so called experts suggest that if you give an ambi first name that the middle name clearly state the sex of the person). Such as in this case. Cecil is also a male name and so is Blaire. Claire will make it clear to whoever that this Cecil is a girl. I wasted time, and now doth time waste me. William Shakespeare

i like the name cecil blaire.