Sanya is from the Sanskrit saṃjñā (सञ्ज्या — distinctive name, consciousness) — also possibly the iconic Russian-Slavic diminutive of Aleksandra. Princess Sanya — Hindu heritage naming.
Sanya 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 Sanya reduce to 6, The Nurturer. This is a traditional interpretive system, not a factual claim about the name.