Jisu is from the Korean ji (지 — wisdom, knowledge) + su (수 — excellence, longevity). Jisu (model) — modern Korean fashion model. Jisu in iconic K-pop tradition — the name is now associated with multiple iconic K-pop members. Jisu Park — modern Korean-American figure. Jisu Kim — modern figure. Princess Jisu — modern Korean heritage naming.
Jisu 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 Jisu reduce to 5, The Seeker. This is a traditional interpretive system, not a factual claim about the name.