Kateřina is the Czech form of Catherine — from the Greek katharos, meaning "pure." One of the most popular Czech feminine names.
Kateřina Siniaková (born 1996) is the Czech tennis player; Kateřina Neumannová (born 1973) is the Czech Olympic cross-country skier.
Kateřina 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 Kateřina reduce to 4, The Builder. This is a traditional interpretive system, not a factual claim about the name.