Calliope comes from the Greek Kalliopē (Καλλιόπη) — kallos (beauty) + ops (voice) — meaning "beautiful-voiced." In Greek mythology, Calliope was the muse of epic poetry, eldest of the nine Muses. She is the mother of Orpheus.
Calliope is rising steadily in the U.S. Today it sits in the U.S. top 500.
Calliope does not currently appear in the US Social Security Administration's top 1,000 girls' names, so we don't publish a US rank or birth count for it. That says nothing about the name's standing elsewhere in the world — only that it sits outside the ranked US data we rely on.
In Pythagorean numerology the letters of Calliope reduce to 1, The Leader. This is a traditional interpretive system, not a factual claim about the name.