Darya has parallel origins. In Russian (Дарья), it comes from the Greek Darius — meaning "possessing goodness." In Persian (دریا), daryā means "sea" or "ocean."
Darya is widely used in Russia and Iran. Darya Klishina is the Russian Olympic long jumper.
Darya 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 Darya reduce to 4, The Builder. This is a traditional interpretive system, not a factual claim about the name.