Meadhbh is from the Old Irish Medb (she who intoxicates) — anglicized as Maeve. Queen Medb of Connacht is the warrior queen at the center of the Táin Bó Cúailnge (The Cattle Raid of Cooley, c. Subject of W. B. Also: Saint Maeve — Irish abbess (5th-6th c.). Central to modern Irish feminist literary reclamation. figure in Irish-language cultural heritage.
Meadhbh 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.
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In Pythagorean numerology the letters of Meadhbh reduce to 5, The Seeker. This is a traditional interpretive system, not a factual claim about the name.