Jovana is from the Serbian Jovana (Јована) — feminine of Jovan (Serbian for John) — from the Hebrew Yochanan (Yahweh is gracious). Jovana is one of the Serbian + Macedonian feminine names — consistently in the top 10 Serbian girls' names.
Jovana 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 Jovana reduce to 9, The Giver. This is a traditional interpretive system, not a factual claim about the name.