It could be any reason. Sometimes when people pick user names it has meaning and sometimes it doesn't have any meaning at all.
My user name was picked because it sounded cool. And I am cool as the breeze if you met me in person. Lol, and it wasn't taken. I like to pick user names that are not already taken.
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I'm a proud 90's kid, I have a huge obsession with my childhood which has cause me to hoard things from my younger years, plus I just love and miss that beautiful decade. Common sense is so common nowadays. Morals, values, integrity, compassion, understanding, etc. seem to be forgotten or left behind in the 90's. Creativity, individuality, and originality in art, music, tv, entertainment, society overall were at all-time highs back then before reality tv, talent-less celebrities, and abuse of technology (social networks cell phones, etc.) influenced the mass the wrong way.