When William Robert Fast was born on 18 August 1854, in Martinsburg, Pike, Illinois, United States, his father, Isaac Jay Fast, was 34 and his mother, Narcissa Amelia Rosa de Malridda Richardson, was 25. He married Sarah Emily Ator on 2 November 1876, in Pike, Illinois, United States. They were the parents of at least 3 sons and 4 daughters. He lived in Milton, Pike, Illinois, United States in 1880 and Pleasant Hill, Pike, Illinois, United States in 1900. He died on 10 October 1932, in Pike, Illinois, United States, at the age of 78, and was buried in Black Oak Cemetery, Martinsburg Township, Pike, Illinois, United States.
North German: nickname for a reliable steadfast person, or from a short form of any of various personal names beginning with the element fast ‘steadfast, firm’, for example Fastert.