It’s the stuff of revolutionaries (Malcolm X) and punks (X, the band). And why did Mr. Musk choose it? In the 1990s, X reigned supreme, after Douglas Coupland’s 1991 novel “Generation X: Tales for an Accelerated Culture” permeated the lexicon. “We were in our 20s when we were named Gen X,” Anthony Sperduti, 50, founder of the branding studio Mythology, said. “So maybe X sounds good to us, because it seeped into our brain.” At 52, Mr. Musk falls right into that demographic.

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Persons: Malcolm X, Elon Musk, Musk, X, Douglas Coupland’s, ” Anthony Sperduti Organizations: Twitter