The UK Information Commissioner’s Office publishes some dummy data here: https://ico.org.uk/media/1432969/exampledataset.csv - the way they generated it is explained here: https://ico.org.uk/media/for-organisations/documents/2021/2618998/how-to-disclose-information-safely-20201224.pdf - as these people are made up they should all be false positives (but there could be coincidental name matches)