Where does “سِفْر” come from?

سِفْر (Arabic) comes from Aramaic סִפְרָא, from Akkadian šiprum — message, report, commission.

Ancestry of “سِفْر”, step by step

Step	Language	Word	Meaning
1	Aramaic	סִפְרָא	—
2	Akkadian	šiprum	message, report, commission