DON, DOWN. DUNE
Basic meaning="elongated hill or ridge"
Place names using the term
Dün in an early English word which has become a common ending for a landmark built on the edge or end of a low hill or range of hills.

South of London there are two ranges of long low hills named the North Downs and the South Downs respectively. Dun has also been used as "dune" (as in sand dune).

It is also where we get the English adjective "down" (meaning "below").

Abigndon
Boldon
Brandon
Faringdon
Huntingdon
Maldon
Shildon
Swindon
Trimdon
Aebba's Hill
Hill with a booth or hut
Hill with broom trees
Hill with ferns
Hunters' hill
Hill bearing a cross
Sloping hill
Swine hill
Hill with elders