Janina is from Janina. Polish feminine of Jan / John + Hebrew Yochanan God is gracious + Saint John the Baptist + Evangelist + King Jan III Sobieski 1629-1696 King of Poland defeated Ottoman Turks at Battle of Vienna 1683 saved Christian Europe + Pope Innocent XI savior of Christendom + Janina Lewandowska Polish pilot only female victim of Katyń massacre 1940 + Saint Jadwiga Queen of Poland founded Jagiellonian University Kraków 1364.
Janina 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 Janina reduce to 4, The Builder. This is a traditional interpretive system, not a factual claim about the name.