Linda is the Spanish word for "pretty, beautiful," or alternately from the Old High German lind ("soft, tender, gentle"). The most popular US baby name from 1947 to 1952, peaking at #1 — over 300,000 American girls were named Linda in that span. Board of Education (1954).
Linda 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 Linda reduce to 4, The Builder. This is a traditional interpretive system, not a factual claim about the name.