My husband has a bad association with my favorite name, [name]Gweneth[/name]. I really love the nickname [name]Gwen[/name], what do you think of an alternate like [name]Gwenevieve[/name] or [name]Gwendolen[/name]?
I absolutely love [name]Gwendolen[/name]! It’s so classy, down-to-earth, regal, and sweet all at once. I love the nn [name]Gwen[/name] for it, but I also love [name]Winnie[/name] and [name]Leni[/name] as nn options. I think [name]Gwenore[/name] and [name]Guinevere[/name] are both great names to get the nn [name]Gwen[/name], too. [name]Gwenevieve[/name] seems like a smoosh of [name]Gwendolen[/name] and [name]Genevieve[/name] to me, personally, though. 
Good luck!
Looove [name]Gwendolyn[/name]! nn [name]Gwen[/name] is adorable, very chic. And [name]Gwennie[/name] is so sweet.
I tend to like [name]Gwen[/name] all by itself. It stands on its own, and adding stuff to it makes it sound princessy and makes it a whole lotta name, as described on here once.
[name]Gwen[/name] can be used as a nickname, but it’s also a legitimate full name by itself. If you don’t like any of the longer forms, you can use just [name]Gwen[/name].
I love [name]Gwendolen[/name], but [name]Gwenevieve[/name] is really awful. I second the suggestions of [name]Gwenore[/name] and [name]Guinevere[/name]. I don’t know if this one will get much love, but I actually really like Gwenno. I’ve seen it used in Welsh birth announcements. Apparently it’s a diminuitive that sometimes gets used as a given name.
I was almost a [name]Gwendolyn[/name] and I always wished my parents had settled on that one! I like the cute nickname [name]Gwen[/name] and prefer [name]Gwendolyn[/name] to [name]Gweneth[/name] (I think Paltrow) or [name]Gwenevere[/name] (I think of knights)…[name]Gwendolyn[/name] is more neutral.
I like [name]Gwendolen[/name] and [name]Guinevere[/name]. With the latter, you have the baggage associated with the Arhurian legend. If that doesn’t bother you, it’s beautiful.
I agree! [name]Gwendolyn[/name] is the perfect alternative.
I love [name]Gwendolen[/name] or [name]Gwendolyn[/name]. [name]Gwenna[/name] is also cute!
I like [name]Gwendolen[/name] and love [name]Gwyneira[/name] which I haven’t seen mentioned yet?
I also don’t mind [name]Gwen[/name] as a standalone name.
I am not as fond of [name]Guinevere[/name].
[name]Gwendolyn[/name] nn [name]Gwen[/name], or my favorite nn, ta-dah! [name]Dolly[/name]! Another poster on this site was considering this name, and you reminded me of it. It is just so darn cute, it could be perfect for you!
xo [name]Viv[/name]
I second [name]Gwyneira[/name]!!