Evelyn was popular previously between 1900's - 1940's; so I'd look at similar period names that have had a recent popularity resurgence like Evelyn - obvious options would be Florence, Beatrice, Ivy, Iris, Violet, Mabel, Daisy, Clara, Ruby, Nancy and Ada.
Or choose classics from the same time (that have only occasionally gone out of fashion) - Lily, Grace, Charlotte, Alice, Sarah, Rose, May, Amy, Lucy, Hannah, Harriet, Laura, Lydia, Catherine, Maria, Josephine, Isabella .
Or go for names from the period the are due a resurgence soon: Lilian, Sylvia, Marion, Hazel, Freda, Nora, Vivien, Constance.