Inherited from Chagatai سلجوقی, from Arabic سَلْجُوقِيّ (saljūqiyy). By surface analysis, سەلجۇق (seljuq) + ـىي (-iy).
سەلجۇقىي • (seljuqiy) (plural سەلجۇقىيلار (seljuqiylar))