Momoe is from the Japanese 百恵 — momo (hundred + peach) + e (blessing, favor). Yamaguchi Momoe (山口百恵, born 1959) is a Japanese singer + actress — widely considered one of the Showa-era kayōkyoku idol-pop stars + the Japanese feminine idol of the 1970s. Japanese feminine idol-pop figure.
Momoe 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 Momoe reduce to 7, The Seeker. This is a traditional interpretive system, not a factual claim about the name.