As mentioned in the title, I would really appreciate some full names for my favourite nicknames:
[name]Maddie[/name]-Other than [name]Madison[/name] or [name]Madeleine[/name]/[name]Madeline[/name]. I actually really like the latter but feel like it is becoming too popular.
[name]Hallie[/name]-I know it is often used as a full name, but it seems a bit to nickname-y to me.
[name]Callie[/name]- The only one I can think of right now is [name]Calista[/name].
Thank You! 
[name]Maddie[/name] - I feel like [name]Matilda[/name] could be a stretch (probably [name]Mattie[/name] would work better, but still).
[name]Hallie[/name] - Tough… Maybe an H-name with [name]Elle[/name]/[name]Ellie[/name]/[name]Lee[/name] name in the middle
[name]Callie[/name] - [name]Callaway[/name] came to my mind instantly, and [name]Calia[/name] which I don’t think is a name… sorry I’m such poor help.
[name]Maddie[/name]- [name]Matilda[/name], [name]Madelena[/name], Madilia, [name]Magdala[/name], [name]Madina[/name], Madara, [name]Madigan[/name], [name]Madonna[/name]
[name]Hallie[/name]-[name]Harriet[/name], Halimeda, Haralda, [name]Helena[/name]
[name]Callie[/name]- [name]Calista[/name],[name]Calina[/name], [name]Caileen[/name],[name]Caitlyn[/name],[name]Cailin[/name], [name]Calixta[/name],[name]Calandra[/name],Caleda,[name]Calliope[/name],Callison, [name]Calypso[/name], Calliah, (ka-lee-ah)
Callina,Calisra, Callirhoe, Callisthene, Calidora, Callianne
[name]Callie[/name]:
[name]Cailin[/name]
[name]Calliope[/name]
[name]Camellia[/name]
[name]Camille[/name]
[name]Carlisle[/name]
[name]Caroline[/name]
[name]Catalina[/name]
[name]Maddie[/name]:
[name]Madigan[/name]
[name]Amanda[/name]
[name]Marigold[/name]
[name]Mathilda[/name]
[name]Hallie[/name]:
[name]Harlow[/name]
[name]Helaine[/name]
That’s a tough one…
For [name]Hallie[/name] I found: Halfrieda, [name]Hala[/name], Halila, [name]Halima[/name], [name]Halina[/name], [name]Nathalia[/name], [name]Thalassa[/name], [name]Thalia[/name] and Zahala.
[name]Hallie[/name]- maybe [name]Hadleigh[/name], [name]Harriet[/name]
[name]Callie[/name]- [name]Caroline[/name]? [name]Catalina[/name]? I honestly like [name]Callie[/name] by itself, seems a bit more complete to me as [name]Calleigh[/name] to be used alone instead of as a nickname.
[name]Maddie[/name]- [name]Magdalena[/name], [name]Madigan[/name], [name]Mathilda[/name],
I can’t think of anything unmentioned for [name]Maddie[/name] and [name]Hallie[/name] but I love [name]Calla[/name] as a full name for [name]Callie[/name] 
[name]Maddie[/name] - Maddon, [name]Matilda[/name]
[name]Hallie[/name] - [name]Harriet[/name]
[name]Callie[/name] - [name]Calla[/name], [name]Calypso[/name], [name]Calliope[/name]
[name]Maddie[/name] -
[name]Magdalen[/name]
[name]Matilda[/name]
[name]Madge[/name]
[name]Hallie[/name] -
[name]Helen[/name]
[name]Hailey[/name]
[name]Hadley[/name]
[name]Callie[/name] -
[name]Calla[/name]
[name]Caroline[/name]
[name]Caleigh[/name]
[name]Calandra[/name]
Callison
I also know a girl named [name]Cameron[/name] who goes by [name]Callie[/name], but thats kind of a stretch
[name]Maddie[/name]: [name]Matilda[/name], [name]Mattea[/name], [name]Margaret[/name] (better if spelled [name]Mattie[/name]), [name]Magdala[/name], Magdelen/[name]Magdelene[/name], [name]Amadea[/name], [name]Madeira[/name], [name]Madigan[/name],
[name]Hallie[/name]: [name]Halcyon[/name]/[name]Halcyone[/name], [name]Halia[/name], [name]Halimah[/name], [name]Halona[/name], [name]Hialeah[/name]
[name]Callie[/name]: [name]Caroline[/name]/[name]Carolina[/name], [name]Catalina[/name], [name]Calandra[/name], [name]Calantha[/name], [name]Calais[/name], [name]Caledonia[/name], [name]Calliope[/name], [name]Calisto[/name], [name]Calypso[/name], [name]Calida[/name], [name]Camille[/name]/[name]Camilla[/name]
Sorry for any repeats…
For the record, I think both [name]Madeleine[/name] and [name]Madeline[/name] are beautiful names, regardless of how popular they are
[name]Maddie[/name]: [name]Madonna[/name], Maddon/Maddyn/Maddin, [name]Amanda[/name], [name]Maddox[/name], [name]Matea[/name], Mattise, [name]Margaret[/name], [name]Marjorie[/name], Madrid, [name]Madelina[/name], [name]Mariette[/name], [name]Martina[/name], [name]Madigan[/name]
[name]Hallie[/name]: [name]Hayleigh[/name]/[name]Hayley[/name]/[name]Haylie[/name], [name]Harley[/name], [name]Helena[/name], [name]Harriot[/name], [name]Hilary[/name], [name]Mahalia[/name]…
[name]Callie[/name]: [name]Camilla[/name], [name]Calista[/name], [name]Carly[/name], [name]Callen[/name], [name]Caylyn[/name]/[name]Kailyn[/name], [name]Carla[/name], [name]Caroline[/name].
Best WIshes x