Soohyun is from the Korean 수현 (Soohyun — soo excellent/good + hyun wise/virtuous — excellent wisdom, bright virtue). Soohyun is one of the Korean feminine + unisex names — central to traditional Korean Confucian heritage.
Soohyun 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.
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In Pythagorean numerology the letters of Soohyun reduce to 9, The Giver. This is a traditional interpretive system, not a factual claim about the name.