User blog comment:Toshiroichigo/Bleach villains/@comment-7092747-20131102202958

I believe Kubo already addressed this matter in an interview when speaking of the Arrancar and stated he intentionally went with a Spanish theme in order to give a sense of foreign-nature to the Arrancar to present a strong contrast to the Soul Society and the Gotei 13. Going with completely different nationalities/cultures for groups makes it far easier to present different ideologies, appearances, and personalities.