Analysis of information sources in references of the Wikipedia article "Ghilji" in English language version.
This dynasty, like the previous Slave dynasty, was of Turkish origin, though the Khaljī tribe had long been settled in Afghanistan. Its three kings were noted for their faithlessness, their ferocity, and their penetration to the South of India.
Indeed, it seems very likely that [the Khalaj] formed the core of the Pashto-speaking Ghilji tribe, the name [Ghilji] being derived from Khalaj.