Cristina is the Italian, Spanish, and Portuguese form of Christine — from the Latin Christiana, meaning "follower of Christ." Queen Christina of Sweden (1626-1689) was the famous monarch who abdicated and converted to Catholicism.
Cristina Saralegui (born 1948) is the Cuban-American TV host known as the "Latin Oprah."
Cristina 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 Cristina reduce to 3, The Communicator. This is a traditional interpretive system, not a factual claim about the name.