Ebla

ma-li-gú-um /malikum/ - king (VE 1088)

PWS
*malik-/*malk- - king (Kogan 2011: 245)

See also *mlk ‘to rule’, PArm *mlk ‘to advise’ and Akk. malāku and milku where the meaning of latter two has been often considered as a semantic source of PWS *mal(i)k- ‘king’: “counsellor, he whose opinion is decisive” (BDB 272, LSyr. 391 and Kogan 2015:92, 419).