I always had a weakness with names, and wanted to name even the kittens that grandma ended up giving away when I was kid.... So naturally my cats have plenty of names. All my three boys have three names. Two given by us, and the third name that they came with from the shelter.
First brothers were Salt and Pepper but I just wanted something more personal because sister-in-law's old-time dog was already Pepper. So they got new names and kept those old names as their third ones.
Our newest cat was named Simon at the shelter - just like every other Siamese cat at the shelter! He really had only had it for 10 days, and since one of his brother's middle name was already Simeoni, we scrapped it altogether
Thus our newest boy got three brand new names.
Nicknames... I don't know... Even newest baby has dozen already...