Mya carries the green fire of the emerald: in Burmese, mya means exactly that precious stone. In the English-speaking world it also reads as a fresh, streamlined spelling of Maya or Mia, and was carried to fame by the American singer Mýa.
Mya 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 Mya reduce to 3, The Communicator. This is a traditional interpretive system, not a factual claim about the name.