I’m not a fan of the name [name]Jessa[/name] because of the [name]Jessica[/name] craze (sorry), but if I had to pick one [name]Janessa[/name] nn [name]Jessa[/name].
[name]Joanna[/name] with the nn [name]Joanie[/name]. [name]Joan[/name] is a name all on its own, so that has potential to be confusing. So I would say [name]Joanna[/name] nn [name]JoJo[/name] or [name]Joey[/name] and [name]Joan[/name] nn [name]Joanie[/name].
[name]Alexis[/name] with the nn [name]Alexa[/name]. Again, they’re both names on their own, so I would pick whichever I loved more if I were you.