That can't be right, or at leats not the whole story. For example, "Joaquin Pheonix" is the most searched person from Gainesville. But there's no mention of Gainesville, or even the state of Florida, on his Wikipedia page. But it does appear to be true that he was a "resident" (more or less) during his teenage years [0].
They explicitly say that in their "data and methods" blurb:
> Person/city associations were based on the thousands of “People from X city” pages on Wikipedia. The top person from each city was determined by using median pageviews (with a minimum of 1 year of traffic). We chose to include multiple occurrences for a single person because there is both no way to determine which is more accurate and people can “be from” multiple places.
> Person/city associations were based on the thousands of “People from X city” pages on Wikipedia. The top person from each city was determined by using median pageviews (with a minimum of 1 year of traffic). We chose to include multiple occurrences for a single person because there is both no way to determine which is more accurate and people can “be from” multiple places.