Ignacio is the Spanish form of Ignatius, a Roman family name of uncertain origin that was early on linked to the Latin ignis, "fire". Saint Ignatius of Loyola, the Basque founder of the Jesuits, made it one of the most honored names in the Spanish-speaking world; Nacho is its everyday nickname. Ignacio ranked number 642 in 2000, spent years just outside the US top 1000 and returned in 2021; it ranks number 830 in 2025.