Margaid is from the Manx Margaid — Manx Gaelic rendition of Margaret — from Greek margaritēs (pearl). Margaid is one of the Manx feminine names — central to traditional Manx Goidelic Celtic heritage of the Isle of Man.
Margaid 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 Margaid reduce to 8, The Visionary. This is a traditional interpretive system, not a factual claim about the name.