Since we are in the mood for the irreverant...
Mine was the name of my character from 'Diablo', from years back. Actually an alternate name but my preferred 'RubberDuckie' was too similar to 'toiletduck' which was the name used by one of my colleagues in the common-pool-use-computer. Since most of the names of the other players had dark,macho, overtones (toiletduck being the other exception,) I wanted something more....shall we say, 'uplifting'
Since then,its stuck