Styliani is from the Greek Στυλιανή (Stylianí — pillar) — feminine of Stylianos from Greek stylos (pillar/column). Styliani is one of the Greek feminine names — central to traditional Greek Orthodox heritage. Greek feminine name reflecting Greek Orthodox heritage.
Styliani 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 Styliani reduce to 1, The Leader. This is a traditional interpretive system, not a factual claim about the name.