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For a start, it's based on tax rolls rather than births, so it's very constrained to those who were able to pay tax, skewing the sample significantly. Secondly, it's a survey of less than half of England's counties, and without knowing which counties were considered we can't know how heavily weighted it was to a particular area (for example, if the author only considered southern counties nearer to London). Thirdly, it looks like spellings have been standardised and combined, which involves assumptions being made on the part of the modern author which do not necessarily represent the perceptions of the people bestowing or using those names.