Hello folks. I just thought I'd post an update here that I finally managed to resolve my Depear line, and made a few breakthroughs with regards to the origin of the Depear family in Lincolnshire. Specifically, I have come to the conclusion they all descend from a certain Matthew Depear who lived 1669-1720. He was a Walloon (Calvinists of 'Belgian' origin, similar to the Huguenots) born as Mathieu de Lespiere (a surname with several variants, including De La Piere and Du Pire) in Thorney, Cambridgeshire. He moved to Moulton, Lincs (pretty close to Thorney) around 1700, where he died in 1720. He was married twice and fathered at least 5 children. All Lincolnshire Depear's are descended through three of his sons, by my reckoning. Possibly all Depear's in England, even, though it is harder to tell if Matthew's siblings and cousins from Thorney left descendants that settled elsewhere. Through my research, I have mapped out the majority of the Depear's from Lincolnshire until the early 1800s.
Anyway, if anyone is interested in knowing more, I'd be glad to share my findings. Probably the easiest thing to do is send me a private message with your email address, and we can converse from there.