Hyojin is from the Korean 효진 (Hyojin — hyo filial piety + jin treasure/jewel — filial piety treasure, treasure of devotion). Hyojin is one of the Korean feminine + unisex names — central to traditional Korean Confucian heritage. subject of pan-Korean Confucian cultural heritage. Korean feminine name reflecting Confucian filial heritage.
Hyojin 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 Hyojin reduce to 9, The Giver. This is a traditional interpretive system, not a factual claim about the name.