Sein means a bead — and by extension beauty, for the bright beadwork prized by the Maasai. It carries colour and grace.
Sein 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 Sein reduce to 2, The Peacemaker. This is a traditional interpretive system, not a factual claim about the name.