I let my dad take my box off to be fixed once, it came back with a sign on the back that says caution my baby on board, ths best number plate I saw on a box was just won. It made me chuckle all day.
Mine was bought when I was still a driving instructor - kids wouldn't learn in a car that was more than a year or so old, so a personal plate was de rigeur. I have P400 ONY - looks best on a square plate, this is now on our delivery van (feed merchant) so still makes sense. OH has JA53 DOG - works in two ways, his name, and one of our dogs is called Jazz. This is on our dog food delviery van!
You've just reminded me. When I was a kid one of the mums had miffy (can't remember how it was made up) but it suited her! Dozy annoying thing and was her nickname.
Also lived next door to a very very rich slimy alcoholic. His initials were grb and on his number plate. He was always known as grub.
Oooo (not horsey) but when worked in a garage we repaired a BMW soft top for a very glamorous very attractive lady how was on the overly large size her number plate was something like B16 B1RD, in fancy font it clearly read BIG BIRD.