Son Ye-jin (born 1982) is the South Korean actress, star of Crash Landing on You.
Yejin 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 Yejin reduce to 9, The Giver. This is a traditional interpretive system, not a factual claim about the name.