Sigrún (Sigrún) combines the Old Norse sigr (victory) and rún (secret, rune) — meaning "victory rune" or "secret of victory." In Norse mythology, Sigrún is a Valkyrie who loves the hero Helgi Hundingsbane.
Sigrún is widely used in modern Iceland.
Sigrun is a compound name. Its parts are sigu + rún — each an attested element with a recorded meaning of its own.
Sigrun 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.
In Pythagorean numerology the letters of Sigrun reduce to 7, The Seeker. This is a traditional interpretive system, not a factual claim about the name.