I’ve noticed this with some stallions, particularly pony stallions.
The name contains a letter suffix at the end? Eg Dornik B
Why is this? What does the letter stand for?
I am curious to know as I think it makes the name look much “tidier” for lack of a better word when compared to horses who carry a stud prefix in front of the name.
Thanks 
Bannockburn Farm uses a single B after the name, altho they don’t breed ponies. The farm is not always a prefix. Many use their initial(s) as a suffix.
In case of Dornik his breeder is named Bönninger and he is owned by Gestüt Bönninger so they put a B behind his Name as all their stallions have.
In some cases people think to put their initials behind a name makes them more important or such e.g. there is a Lady in the US, breeding, original German, inporting horses and she has in her farmname two Initials that she also puts behind the horse she sells . In a lot of cases not even owns at the Point where she offers them for sale.
In Germany People often put their Initial after the (maybe quite common) name when they Register the horse for riding shows with our national FEI branch, no matter whether they bred the horse or not…
Some registries (The Dutch Friesian registry, for one) will put the first initial of the breeder’s last name after a horse’s name if there is more than one horse with the same name that year. (Each year, horse names must begin with the same letter, so it would be easy to have duplicate names.)
