There is a danger when you shorten too much, which can happen as English sometimes is a more concise language. You can lose information – important information. Which is usually bad. But in this day and age that might be a good thing for names as you might have partial anonymity.
What am I talking about specifically? Well, just this week, I realized that Ed could mean any of three common names. Edward, Edwin and Edgar can all be shortened to that.
Then I realized that the other vague shortened name I knew was Mo. This can stand for Morris or even Mohammed. Since we were using non English names, I realized there could be a third name – Mohamar. I was surprised that there were so many possibilities for these two names. So I thought some more.
I eventually put Ed out in front because it could stand for the foreign name Edsel (which I believe is German). But I wanted a race. So I thought more on Mo. And I uncovered girls’ names. Mo could stand for Mona, Maura or Maureen.
Ed has two more female names it could represent: Edwina and Edna.
So, for a long time I was stuck in a two way tie with six names. Still, I wanted to declare a winner for this post and possible for all shortened names.
I thought more about Ed knowing that it was short a woman’s name. Then I stumbled across Edie. It has a long E sound and thus normally wouldn’t be allowed. But the two sounds are the names of the letters in Ed: E. D. So of course they can be shortened to ED and pronounced Ed. I have my winner. Important in this the era of anonymity.
And to add icing to the cake for Ed, I just realized that Mohammed with the spelling I am using, has an Ed in there as well. So it can also be shortened to Ed. That’ 8 short forms that are Ed to 6 short forms that are Mo.
Can you think of an even more vague shortened name? Please share it. With so many names in the world, it’s more than possible I have missed some name that is even more vague.

You can call me Betty, and Betty if you call me you can call me: Alfred, Allan, Alison (and variants like Allison, Allyson), Alexander, Alexandra, Alice, Allan, Alistair, or Ali.
Alberta and Vidal make 11.
Oops. Allan is there twice, but Albert is missing.
Looks like Al is the true champion with 9 names it could represent.