Kathryn is a 20th-century American variant of Catherine — from the Greek katharos (pure). Kathryn Hepburn — covered separately under Katherine. Kathryn Joosten — Emmy-winning Desperate Housewives actress.
Subject of countless 2010 Oscars retrospectives.
Kathryn 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 Kathryn reduce to 7, The Seeker. This is a traditional interpretive system, not a factual claim about the name.