I looooove [name_f]Cordelia[/name_f] but I’m not a huge fan of any of the usual nicknames that goes with it ([name_f]Cora[/name_f], [name_f]Coco[/name_f], [name_f]Delia[/name_f], [name_f]Della[/name_f], [name_f]Lia[/name_f], [name_f]Cordy[/name_f], [name_u]Cory[/name_u], [name_f]Dee[/name_f], etc) which really puts me off the name. Are there any other [name_f]Cordelia[/name_f] nicknames that you can suggest? [name_f]TIA[/name_f]! 
[name_f]Collie[/name_f]
[name_m]Codie[/name_m]
[name_f]Cadie[/name_f]
[name_u]Dell[/name_u]
[name_f]Coral[/name_f]
[name_f]Clia[/name_f]
[name_m]Cole[/name_m]
[name_f]Dia[/name_f]
[name_u]Odell[/name_u]
[name_f]Odelia[/name_f]
[name_u]Ollie[/name_u]
[name_f]Orla[/name_f]
[name_f]Ria[/name_f]
[name_u]Dell[/name_u]
[name_u]Ori[/name_u]
[name_f]Ora[/name_f]
Liddy
[name_u]Allie[/name_u]
[name_f]Ella[/name_f]
[name_f]Ellie[/name_f]
[name_f]Ro[/name_f]
[name_f]Collie[/name_f]
[name_f]Lea[/name_f]
[name_f]Cece[/name_f] maybe? If you give her a middle name starting with C.
The nn I like is [name_f]Clia[/name_f] or [name_f]Clea[/name_f] as suggested by @ashleyjuliette. For me the name is a natural shortening from the lovely [name_f]Cordelia[/name_f].
[name_f]Cordelia[/name_f] nn [name_f]Dahlia[/name_f], maybe? That and [name_f]Odile[/name_f]. I can’t think of anything else that haven’t been mentioned.
[name_m]Eli[/name_m] would be so cute!
Or maybe [name_u]Cory[/name_u]?
[name_f]Cordelia[/name_f]
[name_m]Leo[/name_m], [name_f]Cleo[/name_f], [name_f]Clea[/name_f] , [name_u]Elia[/name_u], [name_u]Ollie[/name_u], [name_f]Callie[/name_f], Cellie
[name_f]Ode[/name_f]/[name_m]Odie[/name_m], [name_f]Edie[/name_f], [name_f]Lila[/name_f] (pr lee-la), [name_m]Cole[/name_m].
[name_f]Delta[/name_f] or [name_m]Corkie[/name_m]
Cody, Chord, Key??, [name_f]Orla[/name_f], [name_f]Coral[/name_f], [name_f]Ria[/name_f]
I personally dig [name_f]Cordelia[/name_f] with [name_f]Della[/name_f] nn, but [name_f]Clea[/name_f] works the best if you want something unusual. I think any nickname such as [name_f]Odelia[/name_f] or [name_f]Odile[/name_f] is not intuitive enough
My first thought was [name_f]Dilly[/name_f], next was [name_f]Ora[/name_f] which I see has been mentioned!
Ellie
[name_f]Elle[/name_f]
[name_u]Ori[/name_u]
[name_m]Cole[/name_m]
[name_f]Clia[/name_f]