Liên is the Vietnamese word for "lotus" — the sacred flower of Vietnam that grows in muddy water but blooms pure. The national flower of Vietnam.
Lien is widely used in Vietnam.
Lien 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 Lien reduce to 4, The Builder. This is a traditional interpretive system, not a factual claim about the name.