Sigrid comes from the Old Norse Sigríðr — composed of sigr (victory) and fríðr (beautiful, fair) — meaning "beautiful victory." The name has been used in Scandinavia continuously since the Viking age.
Sigrid Undset (1882-1949), the Norwegian novelist who won the Nobel Prize in Literature in 1928, is one of the most famous bearers. The Norwegian pop singer Sigrid (born 1996) has brought the name to a new international audience.
Sigrid 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 Sigrid reduce to 3, The Communicator. This is a traditional interpretive system, not a factual claim about the name.