I don't see any entries in the Grantor Deed Book for any of the above, although I don't have the complete books, only the White section.
There are several entries for an Elva, but not Eva.
In the General Index to Deeds - Grantee,
~Dec 3, 1868, Book & Sale, Book 1, Page 625. Joshua Gayle & Wife to Wm. K. (White)
~Dec 8, 1871, Book & Sale, Book 2, Page 382. Joshua Gayle & Wife to Wm. K. (White)
~April 12, 1875, Book & Sale, Book 4, Page 49. Joshua Gayle & Wife to Wm. K. (White)
The same date there was also a transfer to Samuel B. White from Joshua Gayle & Wife. Book 4, Page 48. This could indicate a family connection to Samuel B.
I also have a Samuel B. White in my family. However, I don't believe he's an actual, biological child to Francis T. & Rebecca White. He shows up in the 1900 census in Baltimore, Maryland with the family, claiming to be the "head" and "son" of Rebecca and Francis, although he is never is any other census enumerations with the family. I am looking for a potential father to Francis T. White, and I believe it could be a William, or Thomas.
Hope this helps!