Where does “tonne” come from?

Tonne comes from French tonne, a unit of weight or capacity in commerce and trade.

tonne (English): A metric unit of mass equal to 1000 kilograms....

Definitions

Step	Language	Word	Meaning
1	German	Tonne	barrel, vat, tun, drum; tonne, ton, metric ton;...
2	Middle High German	tunne	—
3	Old High German	tunna	—
4	Latin	tunna	tun, box
5	Proto-Celtic	tondā	skin; surface, skin
6	Proto-Indo-European	tend-	to stretch, to extend; to split, cut off
7	Proto-Indo-European	temh₂-	to stretch, string; to cut

tonne — Etymology, Origin & Word History | Etymology Explorer