Viviane is from the Old French Viviane (lively) — variant of the Welsh Nimue. Viviane is the Lady of the Lake in Arthurian legend — sorceress, lover and student of the wizard Merlin, foster-mother of Sir Lancelot, and the giver of Excalibur to King Arthur. Central to the medieval Vulgate Cycle (c.
Viviane 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 Viviane reduce to 1, The Leader. This is a traditional interpretive system, not a factual claim about the name.