1) The early spelling of ‘rush’, the grass-like plant found in marshy locations. These were traditionally strewn on the floors of dwellings and more important buildings as late as the seventeenth century.
1525 the expence of my lords house att London ... rishes ivd
1609 for 10 burden of rishes against the judge coming 20d, Skipton. The spelling change to ‘rush’ influenced surnames such as Rushton and Rushworth but had less impact on the place-names from which they derive
that is Rishton and Rishworth.