Janani (जननी) is the Sanskrit and Tamil word for "mother" — particularly the one who gives life. The phrase Janani Janmabhumishcha Swargaadapi Gariyasi ("Mother and motherland are greater than heaven") is a famous Sanskrit saying.
Janani is widely used in South India.
Janani 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 Janani reduce to 4, The Builder. This is a traditional interpretive system, not a factual claim about the name.