Sviatlana is from the Belarusian Святлана (Sviatlana) — Belarusian rendition of Svetlana — from Slavic svet (light, world, sacred). Sviatlana is one of the Belarusian feminine names — central to traditional Belarusian Orthodox + Indigenous Slavic heritage.
Sviatlana 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 Sviatlana reduce to 9, The Giver. This is a traditional interpretive system, not a factual claim about the name.