The letter characters in 'Doeld' look to be a much closer fit for this written last name, but could not find this particular spelled surname on the rolls database for the 11th. US Infantry Regulars.
Thank you for sending the link. The image I posted is from the Camp Lawton Roll of Honor. The name does not appear in the roster of the 11th US. I am trying to determine the identity of this person.
By the way the writer connects his capital D's, I am convinced he wrote "Deld".
The explanation of Doeld would make sense. In German, it could be written Döld or Doeld, which is pronounced (roughly) "deld." My German professor would say "hold your mouth in the shape of saying "o", but try to say "e". It works with most of those vowels with umlauts (funny dots over the "o").
Find a Grave memorial for Denis Doeld died 1864. Buried at Camp Lawton Civil War Prison, Millen, Jenkins County, Georgia, United States of America, North America
Denis' in company A could be Hagerty, Nolan, Kenny, Murphy, and O Farrell. Denis' not listed with a company include Phillips, Lenois, Coleman, Shine and Enwright.