In the newer 1.13 snapshots, whenever I try to /give an item with a custom name, it never shows up. When I turn on advanced tooltips, it shows that the item has an nbt tag, and commands like /clear work just fine when clearing items with custom names, so the game does register that it has a custom name, but it never shows it, just the default name. I know it's not a problem with context, as I am using the new 1.13 version of /give
/give @p minecraft:diamond_sword{display:{Name:"Potato"}} 1
That is what I've been using, but the name still displays as "Diamond Sword". It still registers the name though, as when I use
/clear @p minecraft:diamond_sword{display:{Name:"Potato"}}
It does only remove the named sword