First of all, it's Ill Niño. Fix your tags.
Ill Niño was founded in 1998, they had released a demo EP in that same year with Jorge Rosado on vocals. The EP was entitled El Niño, when they were originally called El Niño, after the weather phenomenon. It was until 1999 that they had officially formalized. After Rosado's return to his band Merauder, El Niño signed with Roadrunner Records in 2000, but were forced to change their name because it was already being used by another band. Read more on Last.fm