Well, silly me. I had always assumed that this place on the Thames Estuary took its name from Shell, the oil company, because it was the location of a large Shell refinery (at Stanford-le-Hope)and adjacent jetties in the 20th century. Delightful to discover that it was called Shell-haven centuries before that.
After the refinery closed about 10 years ago, Shell UK sold the site to P&O who established a large container port there.
cum salis grano • Link
Shield Haven also gives good meaning to location, protection from danger.
Thanks to differing diction's of the times.
Chart showing the number of references in each month of the diary’s entries.