Redacted…
You have great family names!
I think both names are very usable (especially as a middle name) depending on the first name.
If you didn’t want to use the full names, you could use [name]Merle[/name] instead of [name]Merline[/name] and [name]Nora/name or [name]Rita[/name] instead of [name]Norita[/name].
Good luck! 
A few ideas:
[name]Katherine[/name] – [name]Katia[/name], Katinca, [name]Theron[/name] (male middle name perhaps)
[name]Sonya[/name] + [name]Norita[/name] – [name]Sonita[/name]
[name]Merline[/name]/[name]Merlin[/name] – For a boy, though a long shot, [name]Emrys[/name] (being the epithet of the Arthurian wizard [name]Merlin[/name]) could work. Or there’s Myrddin, which I personally love.
[name]Joceline[/name]. From [name]Jo[/name], [name]Joseph[/name], and [name]Merline[/name].
Either name would work in the middle…I do like [name]Norita[/name] as a fn, as long as the nn would be [name]Nori[/name] and not [name]Rita[/name]…
Thanks everyone for the comments. More interested in advice on the names [name]Merline[/name] and [name]Norita[/name] themselves than smush names though. Maybe I’m too literal, but I don’t really care for that style of honoring, and I didn’t really like any of the suggestions anyhow, sorry.
I like [name]Merline[/name] much better than [name]Norita[/name]. I think it would make a very cute middle name, but I don’t know if I’d be brave enough to use it for a first name.
I like [name]Norita[/name] better. It sounds fairly nice by itself and has good nn potential - [name]Nora[/name], [name]Nori[/name], [name]Rita[/name]. [name]Merline[/name] is okay, but not my style. I would use it in the middle though.
Is [name]Norita[/name] pronounced [name]Nor[/name]-Et-ah or [name]Nor[/name]-eet-ah or [name]Nor[/name]-eh-ta?
“No-[name]REE[/name]-tah” - basically [name]Rita[/name] with an extra syllable tacked on the front.
I think both [name]Merline[/name] and [name]Norita[/name] are very usable and pretty names.
You have really good names to choose from, they just need a tweek:
Enrod [name]Joseph[/name]
[name]Enid[/name]
[name]Erin[/name]
[name]Josephine[/name]/[name]Josephina[/name]
[name]Jody[/name]
[name]Joss[/name]
[name]Josette[/name]
Peppa ([name]Pepe[/name] is a nn for [name]Joseph[/name])
[name]Katherine[/name]
[name]Ren[/name]/[name]Wren[/name]
[name]Theron[/name]- actually a boy name but sounds nice for a girl too, maybe Theryn/Tharen
[name]Taryn[/name]
[name]Aerin[/name]
[name]Karin[/name]
[name]Kerry[/name]
[name]Kathleen[/name]
[name]Katelyn[/name]
[name]Sonya[/name]
Sonil
[name]Nya[/name], [name]Nia[/name], [name]Naya[/name]
Sony (I knew a boy and a girl with this name)
[name]Merlin[/name]
[name]Merle[/name]/[name]Meryl[/name]
[name]Melanie[/name]
[name]Melina[/name]
Meryn/[name]Marin[/name]
[name]Norita[/name]
[name]Nora[/name]
[name]Noor[/name]
[name]Rita[/name]
Combos
[name]Joseph[/name] + [name]Merlin[/name]= Phelon/Phalon/[name]Fallon[/name], [name]Jolene[/name]/Joelyn, [name]Josslyn[/name]/[name]Jocelyn[/name]
[name]Sonja[/name] + [name]Joseph[/name]= [name]Sophia[/name]
[name]Katherine[/name] + [name]Sonya[/name]= [name]Kaya[/name], [name]Katya[/name]
[name]Katherine[/name] + [name]Merlin[/name]= [name]Marilyn[/name], [name]Kameron[/name]
[name]Norita[/name] + [name]Merlin[/name]= [name]Norma[/name], [name]Melita[/name]/[name]Melina[/name]
Enrod + [name]Norita[/name]= [name]Enora[/name], [name]Dita[/name]
I think you’d be fine using either as a middle name. With the exceptions of announcing the name to everyone & yelling at your kid when they are being bad, how often do people use their middle name? I have lots of family & friends that I don’t have a clue what their middle names are.