The expression "English Walnut" is a pet peeve .... For sure none of it is English and the term has only gotten into use in the last thirty or forty years. Before then it was "Circassian" or "French". i.e., juglans regia. But very little of it came from Circassia or France, for that matter, so that terminology was just as inaccurate then as "English" is now. My own preference is to call it "European", but I am swimming against the tide. My total defeat will come soon, I am sure, when the dealers begin advertising custom rifles by G&H et al from the interwar period as having "English" stocks.