Sabina is the Latin word for a woman of the Sabine people — the Italic tribe whose abduction by the early Romans is recorded in Livy's history. Empress Vibia Sabina (83-136 CE) was the wife of Emperor Hadrian.
Sabina is widely used in Italy, Spain, and Eastern Europe.
Sabina 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 Sabina reduce to 1, The Leader. This is a traditional interpretive system, not a factual claim about the name.