Xuân is the Vietnamese word for "spring" — the season of renewal. Tet, the Vietnamese New Year, falls in early spring and is the most important holiday.
Xuan is widely used in Vietnam.
Xuan 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 Xuan reduce to 6, The Nurturer. This is a traditional interpretive system, not a factual claim about the name.