Los Hermanos Ortiz was the name of a music group originally composed of the Ortiz brothers and a few friends who sat in with them from time to time. The group also changed names over the years until, over time, each of the brothers drifted into the art of making pottery full time. Over time they passed that knowledge on to others in their families and in their neighborhoods. But the Ortiz brothers (and father) were among the very first Mata Ortiz potters.
Some of the above info is drawn from:
Most other info is derived from either personal contacts with family members, contacts with individual traders and ongoing searches of the Internet and closely scrutinizing any data found.