What is Alex a nickname for?

I'm curious, could you please elaborate on the question "What is Alex a nickname for?" Are you referring to a specific person, place, or thing that has the nickname Alex, or are you inquiring about the etymology of the name Alex itself? In either case, I'd be happy to provide some insights or further clarification if needed. It's a common name that has multiple possible origins and variations, so knowing the context might help me give a more accurate answer.