As Wattenberg and I examined the data together, a startling discovery came into focus: Back in the 1970s, singular names grew so popular that they became trends unto themselves. But “it just doesn’t work that way anymore,” Wattenberg said. Nowadays, trends are defined by many different names with similar suffixes. …
According to Wattenberg, Jason barely registered in the 1950s when parents often picked a name following family tradition. If your great-grandfather was named Clarence Leroy, odds were a piece of that name would fall intact to you.
Then came the counterculture movements of the 1960s. For the first time, parents began straying from traditional names. With the guardrails of convention removed, people were free to make up their own minds and forge their own paths. And suddenly, by the 1970s, every other kid was named Jason.
Then a funny thing happened: Names started giving way to sounds. Jason begot Mason, Jackson, Grayson, Carson and a whole family of other “-son” names that together make up a major 21st-century trend for baby boys.
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The Mysterious Tyranny of Trendy Baby Names (archive link) by Daniel Wolfe