Dolgor is from the Buryat-Mongolian Долгор (Dolgor) — Buryat rendition of Tibetan སྒྲོལ་མ་ (sgrol ma — Tara, the Buddhist goddess of liberation). Dolgor is one of the Buryat feminine names — central to traditional Buryat Vajrayana Buddhist heritage.
Dolgor 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 Dolgor reduce to 8, The Visionary. This is a traditional interpretive system, not a factual claim about the name.