Dolors is from the Catalan Dolors — Catalan rendition of Dolores (sorrows) — referring to the Catholic devotion to Our Lady of Sorrows (Mare de Déu dels Dolors). Dolors is one of the Catalan feminine Marian-devotion names — central to traditional Catalan Catholic heritage. The Mare de Déu dels Dolors devotion is central to Catalan religious heritage with the seven sorrows (sept dolors) of Mary.
Dolors 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 Dolors reduce to 2, The Peacemaker. This is a traditional interpretive system, not a factual claim about the name.