Yes, I was given the cookery book as a birthday present a few years ago. Vefa thanks her mother for introducing her to food from her own homeland, which was Constantinople, so perhaps the name originates from there? Vefa also refers to her deceased husband who lectured at Thessaloniki University, so perhaps it is the area where she eventually ended up, but I have no idea if it is a name from that region.
Incidentally, the book Vefa's Kitchen by Phaidon Press is a super book, and much more than just a cookery book. It's and ideal present for anyone who enjoys Greek food.