Hayoon (하윤) combines Korean ha (summer, great) and yoon (allow, abundance) — "abundant summer" or "gentle and great." One of the most popular Korean girls' names in recent years.
Used widely in modern Korea.
Hayoon 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 Hayoon reduce to 6, The Nurturer. This is a traditional interpretive system, not a factual claim about the name.