Dina is from the Hebrew Dīnāh (דִּינָה — judged) — modern American spelling. Dina Fritz is a character in Hajime Isayama's Attack on Titan (Shingeki no Kyojin) manga (2009-2021) and anime adaptation. The Attack on Titan manga has sold over 140 million copies worldwide. After Marleyan persecution, she was transformed into a Pure Titan and exiled to Paradis Island — becoming the Smiling Titan who killed Carla Yeager (Eren's mother) in front of him during the Wall Maria breach (Year 845) — one of the traumatic moments in modern shonen anime.
Dina 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 Dina reduce to 1, The Leader. This is a traditional interpretive system, not a factual claim about the name.