Short form of Albert, Alfred, or Alexander. A common Anglo diminutive.
Al is the great democratic abbreviator of the English-speaking world, compressing a sprawling family of names into two precise letters. It most commonly serves as a short form of Albert (Old High German adal, noble, and beraht, bright), Alfred (Old English, elf counsel), Alan (Celtic, possibly meaning handsome or little rock), or Alistair (the Scottish rendering of Alexander, defender of men). As a standalone given name, Al carries the easygoing confidence of someone who needs no introduction.
The roster of famous Als spans an almost absurd range of American life. Al Capone dominated Chicago in the Prohibition era with his fedora and tommy gun mythology. Al Jolson pioneered popular entertainment in the Jazz Age.
Al Pacino and Al Gore each became shorthand for their respective crafts — the first for volcanic intensity on screen, the second for policy earnestness in politics. Al Green gave the name a silky soul music quality. And Weird Al Yankovic turned it into a brand of cheerful irreverence that has outlasted most of the artists he parodied.
As an independent given name, Al peaked in the early-to-mid 20th century, then retreated as parents favored either the full Albert or Alfred, or newer alternatives entirely. Its renaissance prospects lie in that very plainness — the same minimalist appeal driving names like Abe and Ed back into circulation. Al asks nothing of the world; it simply shows up and gets the job done.