This is my favourite spelling - it's more complete than
Gwendolyn and
Gwendolen. In fact, out of the three spellings,
Gwendoline is the most used in my country (although it is a really, really rare name here...).
I only like
Gwen as a nickname.
Wendy seems more like a standalone name.
In Spanish it's mostly pronounced gwen-do-LEEN, however in Latin American Spanish it's sometimes pronounced like in English.
“Dear optimist, pessimist, and realist – while you guys were busy arguing about the glass of wine, I drank it! Sincerely, the opportunist!”
-Lori Greiner