Hertfordshire Genealogy: McNESS??, Rushden, mid 18th century

It is hard to guess what Meanese may actually be without seeing the register entry and comparing the handwriting with other entries in the same book by the same cleric. Sometimes the signatures on the bottom can help - and witnesses are often related so are worth following up. However I would have thought MacNess was a good shot.
A check of some Rushden records (you had some doubt that this was the right place) I came up with the following surnames in the period of interest to you - none of which seem likely matches. MAILES, MANNING, MARVEL, MAYNARD, MEETKERKE, MELAME, MELLOM, MILLER, MOLES, MORLEY, MUNT
Cousin marriages were quite common so the Sarah who married John may have been related to the Mary who married Henry.
Clearly there were some people called Starr living in Ardeley. However be careful not to jump to conclusions - for instance the register (c/o familysearch) shows a Henry Starr baptised on 4th April 1725 to George and Anne Starr. George and Ann Starr had another Henry baptised on 18th December 1736, and 30 years later a Henry Starr was baptised, parents Henry and Rose Starr. My guess is that the burial register shows that the first Henry died in childhood, while the Henry baptised on 1736 was the one that married Rose. This means that neither can be your Henry.