My name, in full, has 9 letters. I rarely get the whole name, except by my BiL who seems to really like it, or if I'm drifting off -ADHD- in which case my DD has a good eye at noticing this so she might suddenly snap her fingers at me, using my full name, and ask, "......... are you still with me?"
It can be shortened to roughly 7 or more names, but most people use just the one shortening, which I've had the majority of my life so I'm fine with it.
However, some try to take it further by using other diminutives of it, and they are told that isn't my name. If they carry on, they are ignored until they get it right but in some instances, for really stubborn people, I'll find something they don't like and use it on them until they get my name right!!