Vania is from the Russian Vanya (Ваня — diminutive of Ivan) — feminine of John — from the Hebrew Yochanan (Yahweh is gracious). Vania is one of the Russian + Brazilian + Bulgarian feminine names.
Vania 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 Vania reduce to 2, The Peacemaker. This is a traditional interpretive system, not a factual claim about the name.