So the name [name]Nell[/name] has just come to me?
What do you think?
What would go with is as a middle name?
I really like [name]Nell[/name], but usually as a nn-- for [name]Eleanor[/name] or [name]Penelope[/name]. Looking at your list-- I have known a [name]Mary[/name] [name]Nell[/name]-- short for [name]Mary[/name] [name]Eleanor[/name] though. Some suggestions:
[name]Nell[/name] [name]Margaret[/name]
[name]Nell[/name] [name]Irene[/name]
[name]Nell[/name] [name]Cecily[/name]
[name]Nell[/name] [name]Ruth[/name]
[name]Nell[/name] [name]Grace[/name]
[name]Nell[/name] [name]Felicia[/name]
[name]Nell[/name] is cute! I had a crush on it a few years ago. I think I prefer a fuller name (like [name]Penelope[/name] or [name]Helena[/name] or [name]Eleanor[/name]), with the nn [name]Nell[/name]. I think the [name]Nell[/name] on NCIS: Los [name]Angeles[/name] wears it well, too–she’s kind of what I would expect a grown [name]Nell[/name] to act like. 
When I was thinking about adding it to my list, I had seriously considered [name]Aurora[/name] [name]Nell[/name] and [name]Nell[/name] [name]Aurora[/name]. I liked [name]Aurora[/name] [name]Nell[/name] better because I didn’t really want people to call her [name]Nellie[/name]. I really liked (and still like) [name]Nell[/name], but I’ve never been crazy about [name]Nellie[/name], for some reason…
I think something like [name]Nell[/name] [name]Felicity[/name] or [name]Nell[/name] [name]Caroline[/name] or [name]Nell[/name] [name]Clementine[/name] would be lovely as well.
Good luck!
I love [name]Nell[/name] though I too like it as a nickname for something else - I think I’d pick [name]Helen[/name]. I did have a great-aunt who was just [name]Nell[/name].
I think [name]Nell[/name] [name]Susannah[/name] would be adorable.