Sora is a Japanese name written 空 — meaning "sky" or "emptiness." In Buddhist thought, the character also carries the philosophical meaning of śūnyatā, the emptiness or openness that is the nature of all phenomena.
Sora is widely used in Japan for both girls and boys. Two soft syllables, a sky's worth of meaning.
Sora 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 Sora reduce to 8, The Visionary. This is a traditional interpretive system, not a factual claim about the name.