Krystyna is from the Polish Krystyna — Polish form of Christina from Latin Christiana (follower of Christ) from Greek Khristos (anointed one). Krystyna is one of the Polish feminine names — central to traditional Polish Catholic heritage. Polish feminine name reflecting Polish Catholic heritage.
Krystyna 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 Krystyna reduce to 7, The Seeker. This is a traditional interpretive system, not a factual claim about the name.