It is listed as Double X by the Ladies' Art Company and in The Romance of the Patchwork Quilt in America, a fairly comprehensive quilters' resource published in 1935 by Carrie Hall. Other publishers have called it Jacks on Six, Three and Six, Old Maid's Puzzle, Kindergarten Block, and Cat's Cradle.
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If I had really planned ahead, I could have used just a few carefully chosen quilt blocks and made it through the ABC simply by posting them under their different names.
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ABC Wednesday, originated by Denise, now resides in an Anthology site and is also accessible by follwoing links at the ABC Wednesday Linky site.