Has anyone heard of...

Has anyone heard of the girl name Kalliope? It is also sometimes spelled Calliope. Pronounced ka-ly-o-pee, kind of like Penelope. I love this name but wonder what others will think. Is it totally unheard of by most people, or just uncommon? Does anyone know someone with this name? Is it difficult or confusing to read? I love that it unique, but wanted some general feedback and thoughts:)