Hi Jody, Since you posted your message regarding Samuel Darius McCook I have found more information on my own McCook family line and I believe that your Samuel Darius McCook married to Effie Mae is connected to my line.
My great great grandfather Patrick Hamilton McCook and second wife Nancy Elizabeth Hay had the following children: Seaborn, Robert M., Henrietta, Ellen and son Lona(Lonnie).
Seaborn McCook married Gussie Beasley and they had a son named Darius McCook who married an Effie M. (maiden name not known yet.).I have also found Darius listed on census records as S. D. McCook.
If you are still interested in the research or have found further information, I would love to hear from you and share more research data.