[foreign nut ]. It comes from Persia, and is so called to distinguish it from those native to Europe, as hazel, filbert, chestnut. (Anglo-Saxon, walh, foreign; hnutu, nut.)
“Some difficulty there is in cracking the name thereof.
Why wallnuts, having no affinity to a wall, should be so called. The
truth is, gual or wall in
the old Dutch signifleth `strange' or texotic' (whence
Welsh, foreigners); these nuts being no natives of England
or Europe, but probably first fetched from Persia, and called by the
French nux persique. ”