Actually I don't like my username and it comes out of my totally unimaginativeness when I first joined a Danish yahoo group on spanking: 'amads49' – 49 because I was not the first 'amads'!
'amads' was the initial of my first name 'a' followed by the start of my last name 'Madsen'. A few years later some other members called me 'Mads', which happens to be a first name in my country. For some time I felt that was ok and it was the start of my last name; so when I later joined BL I did choose 'Mads' as username.
But now I'm envious of all you with genius usernames
Mads! - How boring!