Ourania I would say like "our-ay-nee-ah", with the "Our" sounding like the english word "our" or "hour".
Urania I would say "yer-ay-nee-ah"
I kinda like
Urania better? It's more in-your-face weird, like almost rebellious about it.
Ourania looks like it's trying to be classy, and I respect that, but
Urania just grabs me, it's a got a sort of electric-seafoam aura, very jazzy.