My 8 year-old dd is a Clare: the only one in her school. In fact, the only child Clare I had come across until recently when I met another two others (slightly younger). Just call me a trendsetter!
Lots of people do spell it with an i but only those who don't know us/her well and once they know it's not a hard name to spell!!
I chose the name because of the meaning and I love it more and more. It suits her really well and I see her carrying it into elegant, graceful, accomplished adulthood.