I'm not sure about this Jones moniker, but here's more info on the term Gen X, popularized by Douglas Coupland...
"Although the term Generation X appears back as far as the early 1960s, it was popularized by Douglas Coupland's 1991 novel Generation X: Tales for an Accelerated Culture, in which Coupland described the angst of those born between roughly 1960 and 1965, who, originally and incorrectly labeled as part of the baby boom generation, felt no connection to its cultural icons. In Coupland's usage, the X of Generation X referred to the namelessness of a generation that was coming into an awareness of its existence as a separate group but feeling dwarfed and overshadowed by the Boomer generation of which it was ostensibly a part. Afterwards the term stretched to include more people, being appropriated by the generation following the Baby Boomers and being used by marketers throughout the 1990s to denote potential buyers who were in their twenties at some time during the decade." Wikipedia
'In Coupland's usage, the X of Generation X referred to the namelessness of a generation that was coming into an awareness of its existence as a separate group but feeling dwarfed and overshadowed by the Boomer generation of which it was ostensibly a part.'
An apt description of a generation that is in many respects a repeat of the "Lost Generation" of the early 20th Century.