Marron is from the Japanese manga — adapted from the French marron (chestnut). Marron is a character in Dragon Ball Z (1988-1995) and Dragon Ball Super (2015-present) by Akira Toriyama. Marron is the daughter of Krillin and Android 18 — a human-Android mixed-heritage character. Resides with her parents at Kame House.
Marron 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 Marron reduce to 7, The Seeker. This is a traditional interpretive system, not a factual claim about the name.