Mishti (মিষ্টি) is the Bengali word for "sweet" — both the taste and the affectionate adjective. Bengali sweets (mishti) are famous throughout India.
Mishti is widely used in India.
Mishti 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 Mishti reduce to 6, The Nurturer. This is a traditional interpretive system, not a factual claim about the name.