If my horses have any registered names than they have been lost by previous owners. However I have renamed 2 of my 3 mares. Poor Magic, her name was just Pony. Pony the pony. I had to change that as it did NOT suit her. Hulaberry was named Sparkles. Did not fit her in the slightest so my husband named her Hulaberry as I couldn't come up with anything. Its a type of white strawberry with red spots (tastes like pineapple), like the flea bitten rose gray mare she is.
Each of my pets and livestock always gets a name and then eventually gets a nickname if they have additional personality. I have some hens that have NO personality or else their original name suits them so well they never earn a nickname. Like a few members have said so far sometime the nickname is for good traits and sometimes it is for bad. Lol!
Hulaberry~ Freight train or M'lady Freight train
Stellaluna (mini pig)~ Squish pig, Smoosh face, Stella, Sweet Honey Ham, Pork Dumpling, (side note: I do NOT eat pork)
Big Red (Ameracuana Rooster)~ Cowboy. He earned this nickname because he jumps on Hulaberry's back and goes for a ride everyday! This makes me incredibly jealous bc I don't get to ride as much as he does. ???
The only livestock I never name is the meat chickens, game fowl, and waterfowl. They are raised to be eaten.