When William Herman Eyer was born on 20 September 1884, in Claremont, Richland, Illinois, United States, his father, George Jacob Eyer Jr, was 55 and his mother, Elizabeth Koertge, was 42. He married Irene Mary Schmoker on 19 June 1920, in Richland, Illinois, United States. They were the parents of at least 4 sons. He died on 18 January 1963, in Olney, Richland, Illinois, United States, at the age of 78, and was buried in Olney, Richland, Illinois, United States.