Llewellyn Covert was born on September 15, 1877, in New Jersey to Henry and Lucinda Covert. His father was a shoemaker who owned $2,950 of real estate and $500 of personal property by 1870. He grew up and attended school in Montgomery, New Jersey, and by 1900, he was working as a telegraph operator.
He married a woman named Lillian around 1901, and they had at least two children: Charles, born around 1904; and Elizabeth, born around 1911. They lived in Trenton, New Jersey, and he worked as an electrician. He died in 1954.