Barbara is from the Greek barbaros ("non-Greek-speaking, foreign") — the same root as "barbarian." Ranked #2 in the US in 1937; held a top-10 spot from 1927 to 1958.
Barbara 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 Barbara reduce to 7, The Seeker. This is a traditional interpretive system, not a factual claim about the name.