Name popularity in forebears.io
The genealogy and name website forebears.io also have popularity charts. Is this chart is correct? See https://forebears.io/forenames/john.
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You can read about forebears' sources and methodology here: https://forebears.io/about/name-distribution-and-demographicsNote that for some countries, the sample size is low. Also, in the past I've found that some of the data may be slightly out of date.For John in particular, in the US, it looks as if the number is at least in the ballpark of being correct.
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