I love [name_f]Jane[/name_f]/[name_f]Janie[/name_f] and though I think it’s just fine on its own I’m wondering if there are any longer names for which they could be nicknames. I’m not high on [name_f]Janet[/name_f]/[name_f]Jeanette[/name_f]/[name_f]Janice[/name_f]. I don’t mind personally if the full sound doesn’t exist within a name (for example, I like [name_f]Tess[/name_f] as a nickname for [name_f]Elizabeth[/name_f]).
Of course it’s okay if there isn’t one, but I’m curious if anyone can think of any!
The only ones I can think of offhand that you haven’t listed are [name_f]Janine[/name_f], [name_u]January[/name_u], and maybe [name_f]Jasmine[/name_f] at a stretch. But I like [name_f]Jane[/name_f] by itself better than all of those. 
Hmm…these are sort of close to [name_f]Jane[/name_f]…
[name_f]Jeannine[/name_f]
[name_f]Janina[/name_f]
Jenneveve
[name_m]Benjamine[/name_m]
[name_f]Marjolaine[/name_f]
[name_u]Germaine[/name_u]
[name_u]January[/name_u]
[name_f]Jaylene[/name_f]
[name_f]Janae[/name_f]
[name_f]Joanna[/name_f]
[name_f]Jacinta[/name_f]
[name_f]Johanna[/name_f]
[name_f]Jeanette[/name_f]
[name_f]Jovana[/name_f]
[name_f]Janessa[/name_f]
[name_m]How[/name_m] about [name_f]Jana[/name_f]? I do like [name_f]Jane[/name_f] by itself.
[name_u]January[/name_u] was my first thought.
I mean, less intuitively, any of the [name_f]Gen[/name_f] names could do it, [name_f]Genevieve[/name_f], [name_f]Geneva[/name_f], [name_f]Jennifer[/name_f], [name_u]Genesis[/name_u], [name_f]Genoa[/name_f] or even [name_f]Gin[/name_f] names like [name_f]Ginevra[/name_f] and [name_f]Regina[/name_f].
Or, of course, a double barrelled, [name_f]Sophie[/name_f]-[name_f]Jane[/name_f], [name_f]Lily[/name_f]-[name_f]Jane[/name_f], [name_f]Daisy[/name_f]-[name_f]Jane[/name_f], [name_f]Jane[/name_f]-[name_f]Marie[/name_f], [name_f]Jane[/name_f]-[name_f]Elysia[/name_f] etc
Janeway would be cute, I think. Or Janiebelle, all one name. Winterjane has a story-quality, too, I think.
[name_u]Love[/name_u] [name_f]Jane[/name_f] as a double-name like NolaJane, EmmyJane, ElizaJane.
But [name_f]Jane[/name_f] by itself does seem plain to me. Can’t think of longer variations other than those previously mentioned, but [name_u]January[/name_u] nn [name_f]Jane[/name_f] seems fresh. [name_f]Janie[/name_f] is lovely for a little girl!
[name_f]Jana[/name_f]ína
…
[name_f]Georgiana[/name_f] - I pronounce it “jor-[name_f]JANE[/name_f]-uh”.
[name_m]How[/name_m] the heck do you get [name_f]Tess[/name_f] from [name_f]Elizabeth[/name_f]? There’s no T or S sound in [name_f]Elizabeth[/name_f] at all…
Janelia- I know someone by this name but I don’t know its origins.
[name_f]Janella[/name_f]
[name_f]Janessa[/name_f]
[name_f]Janela[/name_f]
[name_f]Janely[/name_f]
[name_f]Georgina[/name_f], [name_f]Geraldine[/name_f], [name_f]Jaqueline[/name_f], [name_u]Jayden[/name_u], [name_u]Jamison[/name_u], [name_f]Jacinda[/name_f], [name_f]Jacintha[/name_f], [name_f]Jaelyn[/name_f], [name_f]Janelle[/name_f], [name_u]Jamie[/name_u]-[name_u]Lynn[/name_u], [name_f]Janica[/name_f], Jasleen/[name_f]Jazlene[/name_f], [name_u]Jensen[/name_u], [name_f]Jessamine[/name_f], [name_f]Jenea[/name_f], [name_f]Jennica[/name_f], [name_f]Jenna[/name_f]-[name_u]Lee[/name_u], Jeralyn/[name_f]Jerrilyn[/name_f], [name_f]Jessalyn[/name_f], [name_f]Jessenia[/name_f], [name_f]Jillian[/name_f], [name_f]Jocelyn[/name_f], [name_f]Jolene[/name_f], [name_f]Josephine[/name_f]/[name_f]Josephina[/name_f], [name_f]Jonquille[/name_f], [name_u]Jordan[/name_u]/[name_f]Jordana[/name_f], [name_f]Journey[/name_f], [name_f]Joanne[/name_f], [name_f]Johnelle[/name_f], [name_u]Julianne[/name_u]/[name_f]Juliana[/name_f], [name_f]Junia[/name_f], [name_u]Juniper[/name_u], [name_f]Justine[/name_f]/[name_f]Justina[/name_f], [name_u]Juneau[/name_u]/[name_f]Juno[/name_f]
You could also use a combination of the first and middle name to make up the sounds/letters of the nickname [name_f]Jane[/name_f]. For example: [name_f]Julia[/name_f] [name_u]Lane[/name_u], [name_f]Jemima[/name_f] [name_f]Anne[/name_f], [name_f]Giselle[/name_f] [name_f]Analise[/name_f], [name_f]Joelle[/name_f] [name_f]Anita[/name_f], [name_f]Joy[/name_f] [name_u]Delaney[/name_u], etc.