Where does “rietnesse” come from?

rietnesse (Dutch) comes from Middle Dutch riet, from Old Dutch riet, from Proto-West Germanic hreud — reed.

Ancestry of “rietnesse”, step by step

StepLanguageWordMeaning
1Middle Dutchriet—
2Old Dutchrietreed
3Proto-West Germanichreudreed
Every word from Proto-West Germanic hreud →Every word from Old Dutch riet →Every word from Middle Dutch riet →