Orsa is from the Selkup Orsa — Selkup feminine name from one of the Samoyedic Indigenous languages. Orsa is one of the Selkup feminine names — central to traditional Selkup Indigenous Uralic-Samoyedic heritage of Tomsk Oblast + Krasnoyarsk Krai + Yamal-Nenets Autonomous Okrug Russia. The Selkup people are one of the Samoyedic Indigenous peoples (~4,000 Selkup) Khanty-Mansi-Selkup linguistic kinship Siberian Indigenous shamanic + reindeer-herding heritage.
Orsa 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 Orsa reduce to 8, The Visionary. This is a traditional interpretive system, not a factual claim about the name.