Melody comes from the Greek melōidía (μελῳδία), meaning "song" or "musical composition" — from melos (song, limb of a song) and ōidē (ode, song).
Melody entered the U.S. top 1000 in 1942 and has remained continuously. Today it sits in the U.S. top 175 — a quiet musical name that has never been overused but always been available.
Melody 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 Melody reduce to 2, The Peacemaker. This is a traditional interpretive system, not a factual claim about the name.