Are the two names listed in the title etymologically related? If so, why is the stress on the penultimate syllable in Λεωφόρος Κηφισίας and not on the final syllable, as it is in Η Κηφισιά? In other words, why is it Λεωφόρος Κηφισίας and not Λεωφόρος Κηφισιάς? I know there is also a river named Κηφισός. Does that get thrown into the equation in any way? Τhank you. Ν.Β. I have an extra tone mark in the title that I can't correct. It should be Η Κηφισιά (δήμος). Sorry about that. Mod note: Edited the title for you.