Mine comes from when I started to learn to fly.
Someone bought me a jokey L plate, a big one saying to put it on the side of the aeroplane when I have a lesson.
I placed it on the wall next to my pc and when I came to register on pprune I was stuck. I sat staring at it for ages then suddenly thought hmmmmmmm, thats a big red L so I logged on as that...
Best name I have seen so far is 'Far Canal'.......