The only connction I can find between Yerkes and Atkinson is this one.Perhaps Rachel was named for an aunt rather than for her direct ancestor.
Yerkes, Courtland Carr (7) B: 16 Mar 1850, Abington, Montgomery County, PA M: 15 Jan 1878, Mary Matilda Atkinson b. 11 Dec 1857 at Davisville, Bucks County, dau of Mahlon R. Atkinson by his wife Mary A. Wood. Resided at Hatboro, PA.
FN: Isaac Mann Yerkes 6, Silas 5, Harman 4, John 3, Herman 2, Anthony 1 MN: Jane Murdock Carr
Children of Courtland Carr Yerkes and Mary Matilda Atkinson:
1. Charles M. Yerkes (8) B: 25 Mar 1879 D: 31 Jan 1880
2. Jane Carr Yerkes (8) B: 03 Sep 1881 M: John Wallace Hoff. Resided at Trenton, NJ