Sara is from the Hebrew Śārā (שָׂרָה — princess, noblewoman) and parallel Arabic Sāra (سارة). Sarah/Sara in biblical tradition — the matriarch in Abrahamic religions — the wife of Abraham and the mother of Isaac (Genesis 17:15-16); central to Judaism, Christianity, and Islam; one of the matriarchs of all three Abrahamic religions; appears throughout the iconic Hebrew Bible, the Christian Old Testament, and the iconic Qur'an. Princess Sara — Hebrew-Arabic biblical heritage naming.
Sara 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 Sara reduce to 3, The Communicator. This is a traditional interpretive system, not a factual claim about the name.