Seoyeon is from the Korean seo (서 — auspicious omen) + yeon (연 — beautiful, connection). Park Seo-yeon (Seoyeon, 박서연, born 2000) is a Korean K-pop singer leader + main vocalist of the K-pop girl group STAYC (스테이씨, High Up Entertainment, debuted November 2020). figure in 4th-gen K-pop leadership tradition.
Seoyeon 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 Seoyeon reduce to 8, The Visionary. This is a traditional interpretive system, not a factual claim about the name.