Janvi (जान्हवी) is the Sanskrit epithet of the goddess Ganga — daughter of the sage Jahnu. The sacred Ganges River is personified as Janhvi.
Janhvi Kapoor (born 1997), daughter of the late Sridevi, is the contemporary Bollywood actress.
Janvi 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 Janvi reduce to 2, The Peacemaker. This is a traditional interpretive system, not a factual claim about the name.