يأجوج

Etymology
A Qurʾānic formation later incorporated into the Arabic Islamic lexicon, apparently an alteration of, itself also the source of the Biblical form. The addition of a syllable may have been by influence of, the source of and , and/or motivated by phonic considerations, as  is collocated with  in the two instances of the word's occurrence in the Qurʾān. For other possible phonic changes, compare with, which is often conjoined or juxtaposed in the Qurʾān with such words as and. Compare also with, which, though not used in the Qurʾān, may have been modified by analogy with.