What can 'Ellie' be short for?

[Cass72]

Eloise
Ellen
Eleanor
Ella
....

[Rouge]

Melinda
Melissa
Anabelle/a
Isabelle/a
Odelia
Mirella
Eleanor
Bellatrix

[Ca Plane Pour Moi]

Any name starting or ending with "el" or "elle" or variants.

Ellen, Eliana, Elise, Elspeth, Michelle, Rachael, Danielle... FWIW, DH liked "Ellie" for a girl but none of the long versions of it, I was OK with just Ellie on its own - we had a boy and he now gets called Welly, which is not the usual nickname you'd expect for his name (eg in your case Danielle would usually get Dan/Dani rather than Ellie).

[Caz_88]

i knew a little girl called Ellori growing up, I still loved the name today <3