Rebel factions appear to have obtained secret information regarding the naming of ships and adding those names to Commanders’ hulls.

We can confirm that this information is correct and naming of ships is a feature that will be added to Elite Dangerous: The Commanders (2.3). Everyone will be able to rename their ship for free in game and there will also be the option to purchase cosmetic name plates which will allow Commanders the ability to display that name on your ship’s hull via a special decal. These additional features will be made available in the near future with a catalogue of designs. We’re looking forward to seeing you display your ship names with pride.

I can also confirm that the character limit for ship naming is determined by width.

Have a good evening.