I should have stipulated Catherine/Kathryn was most likely to have used the surnames, Rainbow or May while in England. The surname, Walker, was used between about 1913 to between 1925 and 1930 while she lived in California. To my knowledge, she only used the surname, Sherwood, in California after she discontinued the use of the surname, Walker. I do not know when or where she married Charles Edgar Sherwood, a.k.a. "Dick" Sherwood, a.k.a. Richard Walker, a.k.a. "Dick" Walker. However, the last child she bore with the surname, "May" - Reginald Oswald May - was in Buornemouth, England in 1909, and the first child presumably by her second husband was born in San Francisco, California in 1913. I would assume that Reginald was born at or near a military installation because her first husband, Alexander Geroge May, was a military man.