Meinwen is from the Welsh Meinwen — main (slender) + gwen (white, fair, blessed). Meinwen is one of the Welsh feminine compound names combining the gwen (fair) element — central to traditional Welsh naming alongside Bronwen, Olwen, Rhonwen, Tegwen, and Carwen.
Meinwen 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 Meinwen reduce to 2, The Peacemaker. This is a traditional interpretive system, not a factual claim about the name.