There are family trees showing Merle Hurlbutt, son of Lewis Hurlbutt b. 1865 on Ancestry.
Susan Hurlbut wrote - I am looking for anyone on my father's side of the family. I did not know him well. His name was Merle Carl Hurlbut and I am told that his father (my grandfather) was Louis Hurlbut and that his mother's name was Laura Ward (my grandmother). I don't know if this followup will turn up anything, but it is worth a try. Susan Hurlbut