Ellen G. McKay (b. Evans) (1866-1957) was born in Illinois and died in Los Angeles, California. She married George D. McKay, a physician, in Bement, Illinois, in 1899. They eventually moved to St. Joseph, Missouri, and by 1910 they were living in Los Angeles. McKay studied Christian Science with John F. Linscott, a student of Mary Baker Eddy. The McKays both joined The First Church of Christ, Scientist, in Boston, Massachusetts, on June 23, 1903. McKay's mother, Mary E. Evans (b. Hopkins), as well as her daughter, Georgia D. Osgood (b. McKay), were also members. McKay wrote to Mary Baker Eddy in 1887, inquiring about studying at the Massachusetts Metaphysical College, however there is no record of her doing so. She was listed as a Christian Science practitioner in St. Joseph in the directory of The Christian Science Journal from 1904 to 1905.

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