In response to some drama appearing over the new names given to the Pie Sisters, why not make Inkie and Blinkie be the nicknames they got?
 
It’s similar to how Pinkamena Pie is known as Pinkie Pie. While her nickname is a shortening of her real name, the sisters could have been given nicknames based on other things. (Inkie being a dark color, and Blinkie having blinked a lot.)
 
At least, that’s where I thought their names came from. I only recently learned of the Pac-Man references myself.
 
We are left with Limestone “Inkie” Pie, and Marble “Blinkie” Pie.