I have 7 cats and most of them have nicknames

Ernie = Ernstein (He's a bit dim)
Eric = Bumps (short for fluffy bumpkins)
Ellie = Little Miss Moo Moo
Luke = Luuluke (he fell in the fishpond and we said poor Luulike like poor Looloo from Harry Enfield)
Leia = Miss Cattittude
Timmy = TIMMMEEEEYYYY (wheelchair timmy from southpark)
Harry = H Bomb

I'm expecting the men in white coats any minute now ....

Oh.. I forgot to add some
I also sometimes call her 'Bärchen' or 'Mäusebär' (which means little bear and 'mice bear')

2 kittens

Poppy - Popster
Dodger - Fluff/Furball

and my ancient Geriatric dog

Cassie - Tart/Trollop (its the way she sleeps) lol

We have a variety of names for Fluffy:

Pigeon-prowler.
Sparrow chaser.
Finch-killer.
Magpie-mangler.
Mouse-muncher
Flower-bed crapper
Night-squealer.
Stairwell-stinker.
Car paint-scratcher.

The list goes on and on, depending on what the little rascal has done.

We call ours "freak", mainly has he only had one front leg and bounds around like a squirrel as a result.

This cat sounds like a hand full!

My Patty was officially called Kirkpatrick, but was Patty on her vet record.

However, she got called:
P
Miss P
Princess
Pudding
Pattypie
Pattypaws
Pattycake
Baby Girl
Fat Pat
Pattygirl

Fergus (I didn't choose that, he was called that when he arrived) gets called:
Ferg
Lord Ferg
Sir Fergustopher
Fergustopherson
Fergface
Fergy
Ferginald
Froggy
Frogface
Boyboy
Ferglar the Burglar
Fergington
Big Boy
Boy One

My outdoor cat Mickey gets called:
Mickey
Michael
Mr Michael
Mickmick
Mickmick the Picnic
Michaelton
Michaelford
Little Boy
Boy Two

Last night whilst cuddling Gizmo her sister Bookend was called a "greedy little sh*t" as whilst cuddling Gizmo she took it upon herself to start licking the butter off my Ryvita

I often call them possum chops, little bundles of fur, and less flattering names when they wake me up in the middle of the night as Gizmo climbs up to the cupboard to knock down the tub of Whiskas Temptations to Bookend who is waiting on the floor and then sets about opening them for them both to scoff, its like an SAS raid.

Mr Bigglesworth or Chairman Meow.

I've remembered another one which I've used tonight - it's a wonder my cat remembers his proper name -

muchacho

in all he has 18 nicknames apart from his own - I am a mad cat lady indeed

I'm not big on nicknames, but:

Halfway: Rafi, Finha

Bizu: Zu, Zuzu

Danilo: Dandan, Linho, Lindinho

My old cat was called tammy but had the following nicknames:

Tamlet
Disciple (she used to follow me everywhere)
Smudge (she had a black face with a white bit where the whiskers came out on one side)
Fur

Now i have a dog called milo who has the following nicknames

Iddy biddy (god knows why but i only call him that in private lol)
Baby
Quaver (thats what his feet smelt like when we got him)

Occasionally i call him by the "rejected names" we considered for him which are biscuit, sweep and woof.

He responds to all of the nicknames, his real name and biscuit, although i think thats more to do with the association of the word with food!

I have three cats Alfie, Harvey, and Maisie but only Maisie gets called a pet name which is Maisie Moo or princess

Harley get called Harley barley
and boots.

Jasper gets called the tortoise shell terror.

I have two cats Thomas and Harry. I call them by their name or my love or my darling! Sometimes I call Harry "H", but if anyone ever calls Thomas "Tom", I say "ass"! lol