Naeun (나은) is a Korean name combining na (tree) and eun (grace, mercy). Used as a modern feminine name in Korea.
Naeun (Son Na-eun, born 1994) is the K-pop singer of Apink.
Naeun 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 Naeun reduce to 1, The Leader. This is a traditional interpretive system, not a factual claim about the name.