Oooo, pretty. I've never heard
Lilia before. I'd pronounce it LIL-lee-ah, same as you. I just looked up the popularity of
Lily. I didn't know it was so high. I'm never met a
Lily and only know of one
Lillian. I think
Lilia is different enough that it wouldn't get mixed up with the other Lil-s. Like I said, it's very pretty. I say go for it.