Keh-LYE-oh-pee is the only legit pronunciation. You're welcome to disgaree/prove me wrong.
Call-ee-OH-pee just sounds wrong, and the first pronunciation is much prettier.
Estella Winter is cute, but
Calliope Ever doesn't feel right.
Calliope EvelynCalliope Elka
Calliope ElinCalliope Elsa (I think
Elsa Calliope sounds pretty)