Statistics for occurrence #1 of “Giffen” in chapter 3 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 9: Poetry and Eloquence.:

...attle of Nashville, December 15-16, 1864. in March, 1865, Johnston was again opposing Sherman, this time in the Carolinas, and it must have been in one of the closing battles of the war that little Giffen lost his life. Out of the focal and foremost fire, Out of the hospital walls as dire, Smitten of grape-shot and gangrene, (Eighteenth battle, and he sixteen!) Spectre! such as you seldom see, ...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Isaac Newton Giffen 10 10 0 0 0 user votes
Giffen 18 0 8 0 0 user votes
John M. Giffen 4 0 0 0 0 user votes
I. N. Giffen 2 0 0 0 0 user votes

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