Shanti is from the Sanskrit śānti (शान्ति — peace, tranquility, calmness). Shantideva (c. Princess Shanti — Hindu heritage naming.
Shanti 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 Shanti reduce to 8, The Visionary. This is a traditional interpretive system, not a factual claim about the name.