FamilySearch.org has digitized the United States Confederate Officers Card Index for 1861 to 1865. The cards were acquired from the Military Order of the Stars and Bars, and consist of over 207,000 images. The collection is not indexed at this point, but the collection is alphabetized to make the browsing job easier.
You will find such information as alternate names, name cross references, rank, unit, etc. Each card provides a front and back image, so don't forget to look at both. And since the cards are in alpha order, you may find some additional kin near your ancestor's card.
United States Confederate Officers Card Index, 1861-1865 — FamilySearch.org:
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