My Grandfather (Jacob)changed his name during his lifetime at least once.When born he was 'Jacob Robinson Cohen'.
To make a long story short, I have found legal papers using 'Jacob Caspary Robinson' as his new name.
In our family the males use their mothers maiden name as the middle name. So, I am thinking he took his Grandmothers maiden name when he changed his, since his last name was changed to his mothers maiden name.
1  Isaac Cohen b: Abt. 1868 . +Rae Robinson b: Abt. 1871 in Charleston(?), South Carolina (sister of Dora) ...... 2 Jacob Robinson Cohen b: February 28, 1892 in New York .......... +Chaya Sorah (Sadie) Schnoll b: August 08, 1896 in Vienna or Galecia, Austria *2nd Wife of  Isaac Cohen: . +Dora Robinson b: in Charleston(?), South Carolina (sister of Rae)
...... 2 Arthur Cohen ...... 2 Minnie Cohen b: Abt. November 23, 1895 .......... +Ira Friedman b: Abt. January 26, 1893
Dora & Rae are supposed to also have a brother named Henry.
So what I am thinking is Dora, Rae & Henry's mother would be a CASPARY.
If any of these names ring a bell, please email me.