I would be very interested to hear if you are able to identify any Huguenot communities in Devon. My DURE family is from Devon; they were originally DUREE (acute accent on first e). They were definitely from France. The question is which immigration wave they came with. Some records suggest it might have been as early as the 1200s, which probably means Norman. But others suggest 16-1700's and possibly Huguenot. So, perhaps knowing where yours settled would clarify, as immigrants usually settle together, particularly co-religionists.
Mine were in Stokenham area, Kingsbridge registration, near Plymouth - some are still there, although I haven't pursued this, as mine left in 1830s.