Where does “energy” come from?

Energy comes from Middle French énergie, from Late Latin energia, from Ancient Greek ἐνέργεια, ultimately derived from ἔργον meaning work.

energy (English): The impetus behind all motion and all activity;...

Definitions

Step	Language	Word	Meaning
1	Middle French	énergie	—
2	Late Latin	energia	energy; efficiency
3	Ancient Greek	ἐνέργεια	activity, operation, vigour; workmanship;...
4	Ancient Greek	ἐνεργής	active, effective
5	Ancient Greek	ἐνεργός	at work, active
6	Ancient Greek	ἐν-	in, within; on
7	Ancient Greek	ἐν	in, on, at; among; in, at, or during the time of
8	Ancient Greek	δέρμα	skin, hide
9	Ancient Greek	γλυφή	carving, carved work; hole cut
10	Ancient Greek	-ῐ́ᾱ	{{l\|en\|-ia}}; "suffix forming abstract feminine...
11	Proto-Indo-European	-íh₂	—
12	Proto-Indo-European	-h₂	Creates collective nouns, which refer to groups...

energy — Etymology, Origin & Word History | Etymology Explorer