What is "sompting"

Sompting is a village and civil parish in the coastal Adur District of West Sussex, England between Lancing and Worthing. It is half grassland slopes and half developed plain at the foot of the South Downs National Park. Twentieth century estates dovetail into those of slightly larger Lancing. The name Sompting (known as Sultinges in the Domesday Book) is said to come from the Old English for dwellers by the marsh (Sompt + ingas).