What full names would you suggest for nn [name_f]Sunny[/name_f] (g)? Fairly established names please, but I don’t mind a stretchy connection one bit:)
[name_f][/name_f]TIA
[name_f]Susannah[/name_f] was my first thought
[name_f][/name_f][name_f]Allison[/name_f]
[name_f][/name_f][name_f]Addison[/name_f]
[name_f][/name_f][name_f]Cassondra[/name_f]
[name_f][/name_f][name_m]Emerson[/name_m]
[name_f][/name_f][name_m]Grayson[/name_m]
[name_f][/name_f][name_f]Madison[/name_f]
[name_f][/name_f][name_f]Payson[/name_f]
[name_f][/name_f][name_f]Sonia[/name_f]
[name_f][/name_f][name_m]Mason[/name_m]
[name_f][/name_f][name_f]Sonae[/name_f]
[name_f][/name_f][name_f]Sondra[/name_f]
[name_f][/name_f][name_f]Sonnet[/name_f]
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First thing I think of is [name_f]Sunday[/name_f], which may not be an “established name” honestly I think [name_f]Sunny[/name_f] is fine on its own! But here are a few more:
[name_f][/name_f][name_f]Summer[/name_f]
[name_f][/name_f][name_f]Savannah[/name_f]
[name_f][/name_f][name_f]Sonnet[/name_f]
[name_f][/name_f]Soniva
[name_f][/name_f][name_f]Sonora[/name_f]
[name_f][/name_f][name_f]Cassandra[/name_f]
[name_f][/name_f][name_f]Solena[/name_f]
Here’s a thread where someone asked the same question. You may find some ideas there as well! Good luck! Full Name for Sunny?
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[name_f]Susannah[/name_f] could work
[name_f]Suhani[/name_f]
[name_f][/name_f][name_f]Seraphina[/name_f]
[name_f][/name_f][name_f]Seraphine[/name_f]
[name_f][/name_f][name_f]Sedona[/name_f]
[name_f][/name_f][name_f]Savannah[/name_f]
[name_f][/name_f][name_f]Simona[/name_f]
[name_f]Sunniva[/name_f]! A Scandinavian name that’s rare in the Anglosphere but a perfect long form for [name_f]Sunny[/name_f] 
[name_f]Sunniva[/name_f]
[name_f][/name_f][name_f]Augusta[/name_f] (as in [name_m]August[/name_m] → summer/sunny)
[name_f][/name_f][name_f]Alessandra[/name_f]
[name_f][/name_f][name_f]Saturnina[/name_f]
[name_f][/name_f][name_f]Sidonie[/name_f]
[name_f][/name_f][name_f]Sonya[/name_f]
Sunnia
[name_f]Susannah[/name_f] or [name_f]Susan[/name_f] would be the most established names i can think of [name_f][/name_f]- however whilst tt have the ‘su’ spelling they sound more like ‘soo’
[name_f][/name_f]How about:
[name_f][/name_f][name_f]Sunniva[/name_f]
[name_f][/name_f][name_f]Sonia[/name_f] / [name_f]Sonya[/name_f]
[name_f][/name_f][name_f]Savannah[/name_f] (if you pronounce it suh-vah-nuh)
You could do a name that ends in ‘son’ and pronounce it like ‘sun’, Like:
[name_f][/name_f][name_f]Madison[/name_f]
[name_f][/name_f][name_f]Allison[/name_f]
[name_f][/name_f][name_f]Addison[/name_f]
[name_f][/name_f][name_m]Emerson[/name_m]
[name_f]Hope[/name_f] this helps!
I like
[name_f][/name_f][name_f]Susannah[/name_f]
[name_f][/name_f][name_f]Sunday[/name_f]
[name_f][/name_f][name_f]Soleil[/name_f] (via meaning)
[name_f][/name_f][name_f]Aurelia[/name_f] (via meaning)
[name_f][/name_f][name_f]Solenne[/name_f] (as above)
[name_f][/name_f]Possible for [name_f]Siena[/name_f] given sounds and vibes
Already mentioned but my favorite full name for [name_f]Sunny[/name_f] is [name_f]Sunniva[/name_f] 
My first thought was Sunniva! It’s a scandinavian name meaning ‘sun gift’.
I know someone called Summer who goes by the nickname Sunny.
Some more ideas:
Sunday
Sonara
Susannah
Maddison
Soleil
Savannah
[name_f]Allison[/name_f]
[name_f][/name_f][name_m]Emerson[/name_m]
[name_f][/name_f][name_f]Madison[/name_f]
[name_f][/name_f][name_m]Tennyson[/name_m]
[name_f][/name_f][name_f]Alessandra[/name_f]
[name_f][/name_f]Sonja/ [name_f]Sonya[/name_f]
[name_f][/name_f][name_f]Susan[/name_f]
[name_f]Susannah[/name_f] and [name_f]Sunniva[/name_f] are the first names I thought of that are established. [name_f]Sunday[/name_f] and [name_f]Soleil[/name_f] would also work. Any name that ends with -son or contains -sun in it too 
Sunny is sweet! Susanna was my first idea as well.
-son names obviously would work (Allison, Addison, Grayson/Gracen, Madison, etc.), or maybe a name that has “Sun” in its meaning, like Elanor, Eliana, Marisol, Soleil, Apricity, Asana, Hesperia, Helianthe, Ilyana, Kalindi, Mahana, Mirri, Solara, Soluna, Zara, Zuva?
Some random other ideas:
Sunniva
Sunday
Suellen
Summer
Sutton
Sloane
Sabine
Sabrina
Savannah
Seraphina
Or a combo nickname for something like Sadie Ondine?
My favorite option is Susanna, but I do really like Sunday, Sabine, Sabrina, Seraphina, Sutton, and Sloane!
Good luck!
ETA: Simona nn Sunny is also BRILLIANT!