Siri is a Scandinavian short form of Sigrid — from the Old Norse sigr ("victory") + fríðr ("beautiful"). Siri Tollerød (born 1989) — Norwegian model. Siri Pinter — wife of Carson Daly. The original "Siri" is the lake in Norway from which the name derives. The name's surge after 2011 is among the most-documented cases of brand-influenced naming in modern US statistics.
Siri 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 Siri reduce to 1, The Leader. This is a traditional interpretive system, not a factual claim about the name.