Where does “Jeannie” come from?

Jeannie is an English diminutive of Jean formed with the English suffix -y, which derives from Middle English -y, Middle French -ie, Latin -ia, Latin -ivus, Latin -ia, and ultimately Proto-Indo-European -kos.

Ancestry of “Jeannie”, step by step

Step	Language	Word	Meaning
1	English	Jean	Denim
2	English	Jeanne	—
3	French	Jeanne	Jane, feminine of John
4	Old French	Jehane	—
5	Medieval Latin	Johanna	—
6	Latin	Joanna	—
7	Ancient Greek	Ἰωάννα	—
8	Hebrew	יוֹחָנָה	—
9	Hebrew	יוֹחָנָן	God is gracious
10	Hebrew	יְהוֹחָנָן	God is gracious

Every word from Hebrew יְהוֹחָנָן →Every word from Hebrew יוֹחָנָן →Every word from Hebrew יוֹחָנָה →