This goes to show how careful you have to be with assigning a county to a town/city. Most genealogists will recommend that you write down only what was there at the time, even if the boundaries have moved since then. (A nightmare in point is the city of Bristol, which is variously written as being in Somerset, Gloucestershire, Avon, and its own county of B&NES - Bristol and North East Somerset.)
Olive features in the Murch Surname Study - which covers a LOT of counties!
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