Megumi (恵 or 恵美) is the Japanese word for "blessing" or "grace." Used widely as a feminine name in Japan.
Megumi Hayashibara (born 1967) is the famous Japanese voice actress.
Megumi 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 Megumi reduce to 5, The Seeker. This is a traditional interpretive system, not a factual claim about the name.