Saimdang (사임당) is the art name of Shin Saimdang (1504-1551) — the Joseon dynasty calligrapher, painter, poet, and Confucian scholar. She is the only woman ever featured on Korean currency — the 50,000-won note since 2009.
The first woman on Korean currency.
Saimdang 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 Saimdang reduce to 5, The Seeker. This is a traditional interpretive system, not a factual claim about the name.