These are presumably from Social Security registrations, so reflecting official given names.
replyAnother interesting analysis would be the movement back and forth between full names and their associated common diminutives.
Yes, the data comes from the US Social Security Administration from 1936–2025
replySource: The expandable "How we measured it" section at the bottom of the page
Common nicknames eventually just become given names on their own, like "Jack" or "John" or "Alex".
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