Olesya (Олеся) is the Ukrainian feminine name meaning "of the forest" or "forest girl." The 1898 novella Olesya by Alexander Kuprin is a classic of Russian literature.
Olesya is widely used in Ukraine and Russia.
Olesya 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 Olesya reduce to 5, The Seeker. This is a traditional interpretive system, not a factual claim about the name.