As in, both first and last name start with A. Link goes to b-ref A names.
Cubs have a good start with Albert Almora, Alfredo Amezaga, and Arismendy Alcantara in the minors. Putting Almora in CF and the other two in the middle infield, we can round out the roster with:
C Andy Allanson
1B Andy Abad
3B Angel Aragon
LF Art Allison*
Bench IF/OF Alexi Amarista, Alf Anderson, Andy Anderson, and Alex Arias
Bench C Alan Ashby and Alex Avila
Righty starters Andy Ashby, Al Atkinson, and Al Autry
Lefty starter Allan Anderson
Lefty relievers Al Aber and Armando Almanza, with Abe Alvarez as the swingman
Righty relievers Antonio Alfonseca and Alberto Arias
Closer Ace Adams
That leaves us without a right fielder, but surely there's room on this squad for Henry Aaron.
Andy Allison and his 17 OPS+ in 1872 didn't make the cut.
*Arthur Algernon Alllison was obviously a AAA player, but league affiliations were fluid back then.