My friends' boy twin is currently Peepy Jellyby (after a character in Bleak House, he is very Dickensian) and girl twin is Bladem (after a "word" she says a lot).
(I had a cousin who was called Baby Sister almost exclusively until she was about 8, and I'm fairly sure she thought it was her real name, and Marissa was the nick.)
My maternal grandfather's only sister (one girl & 4 boys) was called Sis her entire long life.
My paternal grandfather's sister was called Tia (as in, the Spanish word for aunt) by almost everybody except her brothers.
My middle name (my actual, legal middle name, that is, instead of what my family tells everyone what my middle name is) is quite pretty. It's the combination of my paternal grandmother's first name, and her mother's first name. My only quibble with it is that one of my uncles used it to name his daughter, and I have never been overly fond of or impressed by her.
(What my family tells everyone my middle name is?
Vegamatic.
No, I'm not kidding.)
I had a cousin
I should clarify...I still have that cousin. She's just not called Baby Sister any more.
I shall now call you "Sunny" or "Suns".
Don't you dare.
Kids just beggin for it, ain't he?
I seem give people completely random and nonsensical nicknames. Like the time I renamed our friend Todd to Bertram Woogums the III. Everyone calls him Woogums now, and he answers to it.
My dad went from Wilmer Leo to "Skipper." It had something do do with the dog.
When dad (as usual) failed to show up at some family thing, they took a picture of my uncles with the dog, Skipper. Like so [link] You can tell my uncle Johnny thinks this is the funniest thing ever.
I've always been "Kathy," evcept for high school and college, when I changed it to "Kathie." I didn't voluntarily change it back, but my first job out of college, the HR people made me up a name plate that said "Kathy," and I didn't feel like arguing the point, so I went back to that spelling. My sister used to urge me to change my professional (i.e., grown-up) name to "Kathryn," just because it sounded more businesslike, but that's not me. She had to, because she's in a male-dominated field and the name "Kris" kept making people think she was a guy, but "Kristine" solves that problem. I still call her "Kris," though.
My mom's name progression is more interesting--she took her first husband's name upon marriage, and then when she married my dad a few years after the divorce from husband #1, he liked the fact that her middle name gave her the same initials as him, so she went with Firstname Middlename Dad'slastname, instead of Firstname Maidenname Dad'slastname, which she would have preferred (she hates her middle name, Agnes). After divorcing him 15 years later, she kept his name just because of us three kids--less confusing to have one name instead of two in the household. But, she did change her official name to Firstname Maidenname Dad'slastname. After marrying Wayne a few years ago, she's now Firstname Maidenname Wayne'slastname, which I'm still getting used to.
Family nicks are the weirdest. My dad called me Noodle and Nadilimos as a child, and Scoobywatchie as a baby (?). Limos (pronounced LEE-mohs) caught on with the extended family and they all still use it. GF loves to laugh at cards from my aunt Lynda that are addressed to Limos. My brother (John) was John-poot-bootie and Johnson (they still call him that) as a baby/child. I think I'm the only one that calls him Johnny.
Other odd nicks in the family include Swazi (my aunt Suzee [Suzanne]), Narpy (my aunt Happy, who is really named Joanna), Kebo (my cousin Kelly), Martini (my cousin Marty), and Honey (what we called my grandma, who was Joey, short for Joanne).
My last name isn't all that difficult, but it is uncommon. As such it almost always gets butchered.
I am not an Andy. Ever.