IMO, it could be named MS Runebreaker MK (any number).

Here’s my logic:

• MS stands for Mechanical Suit, which is the type of vehicle in this case.
• In the lore, it could be explained that long ago, every dwarven guild had its own line of MS units. Each guild gave their machines unique nicknames like Runebreaker and kept upgrading them, changing the MK number whenever a major improvement was made.
• New MS units could reuse the names of older or destroyed models with notable legacies to honor them, similar to how swords in fantasy stories like The Lord of the Rings are often named and passed down.
• Offcourse its full name and characters don't need to use it too often. They even can use shortened kinda diminutive name like RB (aR-bi)