Where does “jenny” come from?

Jenny is a feminine diminutive of Jane in English, ultimately derived from Latin Iohannes.

jenny (English): A device for spinning thread from fiber onto...

Definitions

Step	Language	Word	Meaning
1	English	Jenny	A Wren; A Curtiss JN-4 airplane
2	English	Janet	—
3	English	Jane	A woman, often specifically a girlfriend;...
4	French	Jeanne	Jane, feminine of John
5	Old French	Jehane	—
6	Medieval Latin	Johanna	—
7	Latin	Joanna	—
8	Ancient Greek	Ἰωάννα	—
9	Hebrew	יוֹחָנָה	—
10	Hebrew	יוֹחָנָן	God is gracious
11	Hebrew	יְהוֹחָנָן	God is gracious

jenny — Etymology, Origin & Word History | Etymology Explorer