Iliyana is from the Bulgarian Илияна (Iliyana) — Bulgarian rendition of Slavic feminine derivative of Elijah/Ilya (Hebrew Eliyahu — my God is Yahweh) sun-light associations. Iliyana is one of the Bulgarian feminine names — central to traditional Bulgarian Orthodox Christian heritage. Bulgarian feminine name reflecting Bulgarian Orthodox heritage.
Iliyana 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 Iliyana reduce to 8, The Visionary. This is a traditional interpretive system, not a factual claim about the name.