Joanne is the English feminine of John — from the Hebrew Yochanan ("God is gracious"). Married Paul Newman in 1958; their 50-year marriage was among the most enduring in Hollywood history. Cecil B. Joanne "Jo" Rowling (born 1965) — British author; the Harry Potter series has sold over 600 million copies worldwide; chose pseudonym "J.K." because her publisher worried boys wouldn't read books by a woman.
Joanne 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 Joanne reduce to 5, The Seeker. This is a traditional interpretive system, not a factual claim about the name.