Meghan is a Welsh variant of Megan — the Welsh diminutive of Margaret, from the Greek margarites (pearl). Northwestern grad; Suits actress 2011-2017.
Subject of countless royal histories.
Meghan 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 Meghan reduce to 3, The Communicator. This is a traditional interpretive system, not a factual claim about the name.