When I started racing, I always filled out my name with my middle initial E.
One of my club members used to make sure to tease me about being
Dale "E" Covington......
At that time Johnny 'O' Mara was riding quite well, if memory serves the year I started riding he won the Moto X Des Nations on a Honda Mugen 125. Beat all the 250's and 500's on it. So at some point his handle became Johnny 'O' Show.
For some reason, it was certainly not for any riding ability that approached Johnny 'O', my friends started calling me Dale "E" O. I've been going by that nick name for 32 years now.