There is also a crossed out rendering of his first name as well on this card. That name, Adam, gave me a variant to think about that I had not thought to look for before. It is not a phonetic variation as much as a incorrect reading of the handwriting on some of the documents.
These cards are in a series titled Index to Selected Final Payment Vouchers, 1818-1864 and available digitally at Fold3.
The Index to Selected Final Payment Vouchers 1818-1864 is available on Fold3