Where does “sūqum” come from?

sūqum (Akkadian) comes from Akkadian siāqum, from Proto-Semitic *ṣ́yḳ-.

Ancestry of “sūqum”, step by step

Step	Language	Word	Meaning
1	Akkadian	siāqum	—
2	Proto-Semitic	*ṣ́yḳ-	—