Where does “sabbat” come from?

sabbat (Old French) comes from Latin Sabbatum, from Ancient Greek σάββατον, from Aramaic שַׁבְּתָא, from Hebrew שַׁבָּת, from Akkadian šapattum — 15.

Ancestry of “sabbat”, step by step

Step	Language	Word	Meaning
1	Latin	Sabbatum	Sabbath (the Jewish day of rest, i.e., the biblical seventh day of the week)
2	Ancient Greek	σάββατον	Sabbath
3	Aramaic	שַׁבְּתָא	sabbath
4	Hebrew	שַׁבָּת	Sabbath, Shabbat; weekly day of rest; sabbath
5	Akkadian	šapattum	15