Where does “Acre” come from?

Acre comes from French Acre, from Latin Akre, from Ancient Greek ἄκος, of unknown ultimate origin.

Ancestry of “Acre”, step by step

Step	Language	Word	Meaning
1	French	âcre	acrid, bitter; sour, bitter
2	Latin	ācer	—
3	Latin	saccharum	sugar
4	Ancient Greek	σάκχαρ	sugar; sugar cane
5	Sanskrit	शर्करा	gravel, grit, pebbles, shingle, gravelly mould or...
6	Proto-Indo-Aryan	śárkaraH	—
7	Proto-Indo-Iranian	ćárkaraH	—
8	Proto-Indo-European	ḱorkeh₂	gravel, boulder; boulder; gravel