There are Coach's in Terrant Co., TX.,and in Harrison Co., TX.
My husbands family is from Harrison Co., TX. His Grandfather was William Ted Coach, married Lorene Tittle. There is also a Jefferson David Coach, married a Ruth Marzell-Chase. They had these children that I know of: Larry Edward Coach born 1944, and Judy Lynn Coach born 1946; in Harrison Co., TX. There is also a Jess Coach married a Flossie Nelson. They had Charles Michael Coach born 1946.
Do not know if they had any other children. Maybe this will give you a place to start. I've been looking for my husbands family lines for two years. I just finally cornored everyone and badgered them into remembering at least some names. Ha Ha.
Theresa