I have an under-developed theory blades can be a given a new name by the one who forges them into a black blade.
Zoro's claim to GOAT swordsman will probably be forging 3 swords, so I don't know if he'll rename all of them, but I do like the idea of
- Wado being renamed for Kuina
- Sandai Kitetsu to something reflecting Ringo or the Shimotsuki as a nod to his Wano ancestry
- Enma to something like Kuro/Black as a nod to Mihawk and/or the Underworld/Reaper
Enma is already a really fitting name for the Underworld theme though, and a cool name in general.