National Grid of Clay's. - (This site is copyrighted by Clay of Derbyshire. All rights resrved. 2016).

The following graph is a survey done some years ago by David Clay, compiled from numerous archives which show the county locations of the Clay surname and the century in which they appear. The county of Lincolnshire has the most references for pre-1600 Clay surnames documented followed by Yorkshire and then Derbyshire.

The survey is not claimed to be a complete record, counties omitted failed to reveal references of any pre-1600 Clay surnames. (Note this graph is now out of date more  early Clay's now found).