The name of the Corn Minor Elf had not yet been decided by Liszt.
The name of Thorn Minor Elf Jela stemmed from "Rise of the Thorns," while the name of Mangrove Minor Elf Nami came from "Tidecaller." Both were heroes from "League of Legends", but it seemed there were no heroes related to corn.
"It's not that there are none, for the explosives expert Jiggs does have a connection with corn—explosions, popcorn. However, Jiggs as a name is not flashy enough, nor is it solid or vivid. Besides, I remember the steward of the Fruit Thief Monkey Training Ground is called Jiggs, so to use that name again would be awkward."
Therefore.
After thinking for a long time and not finding a suitable name, he simply made a random decision, "Just call it... Mickey."