Vianne is a French name from the root via (life), making it a feminine cousin of Vivian.
Vianne has been rising in the 2020s, both from Chocolat and from Kristin Hannah's The Nightingale (2015) where Vianne Mauriac is the heroine.
Vianne 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 Vianne reduce to 2, The Peacemaker. This is a traditional interpretive system, not a factual claim about the name.