Iwona is from the Polish Iwona — Polish rendition of Yvonne — from the Old French diminutive of Yves (Germanic Iwo, yew tree). Iwona is one of the Polish feminine names.
Iwona 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.
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In Pythagorean numerology the letters of Iwona reduce to 8, The Visionary. This is a traditional interpretive system, not a factual claim about the name.