Enix's name is a play on the words "phoenix", and "ENIAC", the world's first digital computer.
8.25% of Square Enix is owned by Sony. Sony originally purchased the stake in Square at 18.6%, which decreased after the Square Enix merger.
Besides sharing a few visual similarities, the characters Axel (Kingdom Hearts) and Reno (Final Fantasy VII) share the same voice actor in multiple languages. Tetsuya Nomura did this intentionally to experiment with putting a familiar character in a new environment and role. He also stated in an interview that the two are "different people, but subconsciously alike".