Ellington was born in North Carolina in 1889 to Sheriff Jesse T. Ellington and his second wife Sallie Williamson. He had six half siblings from his father's first marriage. His mother died in 1901 when Eric was 12 and he went to live with an older half-brother John Ellington and finished grade school. He graduated from high school in 1905 at 16.
U.S. Navy
Ellington started at the Naval Academy at age 16. He graduated in 1909 third in his class and received a Bachelor's Degree. He spent the next two years in mandated Naval being commissioned an Ensign in June 1911. He resigned his commission in November 1911 to accept a commission the U. S. Army.