When Mary Alice Yerkes was born on 13 May 1861, in Brooklyn, Kings, New York, United States, her father, Rev. David John Yerkes, was 36 and her mother, Sarah Elizabeth Taylor, was 34. She married Walter Miller McGee about 1882. They were the parents of at least 1 son and 1 daughter. She lived in Somerset, New Jersey, United States in 1905 and North Plainfield, Somerset, New Jersey, United States for about 30 years. She died on 11 June 1949, at the age of 88, and was buried in Scotch Plains Township, Union, New Jersey, United States.
Americanized form of German Jerkes, Jerks, a patronymic from the personal name Jerke .