The Deyo family are French Huguenots who came to the US in the late 1600s and settled in Ulster Co, New York. The details are in "The Deyo Book" by Hasbrouck. The original edition was written in the 1950s and updated in the mid 1980s. I'm pretty sure the LDS has it on microfilm, though it also is avavilable in several large genealogical libraries. Good Luck in your research.