Maybelle is a 19th-century American elaboration of May (the month, or short for Mary) + the French belle (beautiful) — "beautiful May." Mother Maybelle Carter (1909-1978) — born Maybelle Addington — American guitarist and singer of the Carter Family, the first vocal group inducted into the Country Music Hall of Fame and widely considered the founding family of American country music. Her "Carter scratch" guitar style — playing the melody on the bass strings while the treble strings strum the rhythm — transformed the guitar from an accompaniment instrument into a lead voice in folk and country music. Three of her daughters became country stars; daughter June Carter married Johnny Cash. Maybelline cosmetics (founded 1915) takes its name from the founder's sister Mabel.
Subject of Mark Zwonitzer and Charles Hirshberg's Will You Miss Me When I'm Gone? The Carter Family & Their Legacy (2002).
Maybelle 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 Maybelle reduce to 3, The Communicator. This is a traditional interpretive system, not a factual claim about the name.