The Velmoc-Dac constituted a tribal division of the Velmocspecies, originating from the planet known as Velmor. Notably, the Human individual named Ergric Betos was, at some stage, integrated into the Velmoc-Dac community and culture.
Sources
"Velmor: Royalty and Rebellion" article, formerly available on Wizards.com (now outdated, using backup link)