Andrea is the feminine of Andrew — from the Greek andreios, meaning "manly," "brave," or "strong." The same root gives the word "androgynous." In Italian, Andrea is a male name; in English and Spanish, it is female.
Andrea has been continuously in the U.S. top 500 since 1880. It peaked at #20 in 1980 and remains in the top 200 today.
Andrea 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 Andrea reduce to 7, The Seeker. This is a traditional interpretive system, not a factual claim about the name.