Countries
Read onlyThe "proper" way to handle it is to contact seller support and ask them to change your "size name." It’s usually a locked attribute, but with a bit of persistence, it can be updated. Definitely give a flat file a shot first.
Or, you could take a shortcut! (cheat) Most items have multiple types of variations, like "scent name," "colour name," or "pattern name." Just pick one that fits—personally, I go with "pattern," since it can be anything—and then tweak the listing to use "pattern" for variations instead of size.