Catrin is from the Welsh Catrin — Welsh rendition of Catherine — from the Greek Aikaterine (pure). Catrin is one of the Welsh feminine names — central to traditional Welsh-language heritage. Catrin ferch Owain Glyndŵr (c. Welsh-language feminine name.
Catrin 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 Catrin reduce to 2, The Peacemaker. This is a traditional interpretive system, not a factual claim about the name.