There are 3 girls in my DD's group with the same name. It is a short name that ends in a 'y' sound, can't be abbreviated and has no real nickname version. The coaches have creatively (not) been calling them ****1, ****2 and ****3 when it isn't obvious which one they are calling.
I personally would find it a bit annoying if I had a number tacked on at the end of my name, but the kids and the parents don't seem to mind (it's not like they are constantly referred to in this way). The youngest seems to take great pride in the highest number and I've heard her say that she wishes she could be called ****100
Here's some nickname weirdness for you - although I don't like my name abbreviated (unless by older people with British accents...) I will happily answer to Christine without blinking as people have for some reason regularly called me that in the past. People also regularly call me Elizabeth, which I will correct, but am constantly amused that such a large number of people decide that my name is Elizabeth!
<goes off to check if there is a large tattoo across forehead saying Elizabeth>