Senja means dusk and twilight — the golden calm at the end of day. It carries beauty and quiet.
Senja 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 Senja reduce to 4, The Builder. This is a traditional interpretive system, not a factual claim about the name.