What's in a name?

[OzJavelin]

I suppose it's my own fault 'cos I don't use my "correct" name .. typically I use Rod instead of Rodney. But why is it when I email people, my user name starts "rodney", approx half respondants (who don't know me) will reply to "Rob"???

I also get this when I speak to people face-to-face and call them .. approx half call me Rob; which I can more understand than the email thing.

Is my name that difficult to comprehend/process/remember? Anyone else get on a regular basis?