I’ve been called DJ C (by audie), Kid C (by Wolfgang) and my favourite dimples (by Freya and now Kiki) my hope is that all my villagers end up calling me dimples.
Bill wanted to call me Iron A and I thought that was to similar to Irony, so I told him to call me Awesome A (since I couldn't think of anything better). Tammy soon adopted it and Merengue came to me the other day to start calling me Biscuit, in which I said yes.
Lolly, who started the "butterbean" craze on my island, has now moved on and decided that "pumpkin" is a suitable nickname. I expect to be "rutabaga" by mid-summer.
My villagers keep coming up to me saying they picked out a nickname for me, but I always tell them NO. I prefer they call me by the name I picked at start of game.