Sirpa is from the Finnish Sirpa — splinter, piece, fragment — coined as a modern Finnish-language feminine name during the Finnish national language revival (1860s-1920s, Fennoman movement). Sirpa is one of the modern Finnish feminine names.
Sirpa 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 Sirpa reduce to 9, The Giver. This is a traditional interpretive system, not a factual claim about the name.