Dunya (دنيا) is the Arabic word for "world" or "earthly life" — distinct from the afterlife (akhirah).
Dunya Mikhail (born 1965) is the Iraqi-American poet.
Dunya 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 Dunya reduce to 2, The Peacemaker. This is a traditional interpretive system, not a factual claim about the name.