If it is Dowsett why does it have a 'd' at the end?
It certainly looks like a ‘d’, and none of the other words ending in ‘e’ have been written this way. I’m not sure of Dowsette or my own guess of Donsette, to be honest!
I’ve looked on FindMyPast, where there are two transcriptions relating to the marriage:
Essex Marriages and Banns 1537-1935 have it transcribed as Dowsettd
and
England, Boyd's Marriage Indexes, 1538-1850 have it as Dowsett
Not sure if this helps at all!