Tiziana is the Italian feminine of Titian — referring to the gens Titia, also linked to Titian, the Venetian Renaissance painter (Tiziano Vecellio, 1488-1576).
Tiziana Lodato (born 1976) is the Italian actress.
Tiziana 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 Tiziana reduce to 8, The Visionary. This is a traditional interpretive system, not a factual claim about the name.