Good try, Mike. The Y block was Ford's answer to the SB Chevy. Not too good of an answer, I might say, even though it did have some successes. The Y block got its name from the deep-skirt design, much like the FE's, whose pan rails extend below the crank center. The small block's pan rails are essentially even with the crank main centers.
Again, what was the original name of the small block?