Ngọc is the Vietnamese word for "jade" or "gemstone" — derived from the Chinese 玉 (yù). Jade is the most precious stone in Vietnamese culture.
Ngoc is widely used in Vietnam.
Ngoc 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 Ngoc reduce to 3, The Communicator. This is a traditional interpretive system, not a factual claim about the name.