[muggsy]

If you consider the pen swipe, I think the first letter could also be a J. The letter being called an X could easily be a Y. That'd give us -iyl-

But, I think the biggest thing here we've been overlooking is why a person would only sign one name? The first letter could be a first initial? But the next don't seem to be a capital for the last name then. Or maybe it's a 1 word nickname...

And, If this is a lower level player, or someone making their first autographs, you would think it would be a more classic cursive methodical signature; especially for the time. Seems like it'd be someone who's used to signing a lot of quick autographs.