Also, Tinder exists as is in the QC universe, in place of some trademark friendly joke stand-in, such as "Striker & Flint".
kindling - touchwood - spunk - fuel - amadou - fire - ignition - wood - hearth - igniter - punk - lighter
and more than likely a few more I missed.
Igniter actually sounds reasonable as a branding name.
Many of those may already be registered trademarks. I tried things like "Striker", "Flint" and even "Fireiron" were registered. Maybe by trademark vultures systematically registering every word in the dictionary, so one could buy them in reasonble (if inflated) price for real use, but still.
I'm not even sure if "Flint & Striker" is acceptable, if "Filnt" or "Striker" are registered. How would either party ("Flint" or "Striker") attack me and how would I fight back?
It could also be made in the animesque near equivalent, symbiosis or alternative spelling ways:
Tender / Thunder / Blunder
Tumbder / Twitder / Snaptchdner
Tinbler / Tintter / Tindchat
Tindoe / TeenDeer / Tendeuer
...though his choice of moniker should be a clue.
I just thought out, what sort of associations does "Brun" brink to a native English speaker? Fart/digestive noices?