Looking at the Chinese government-managed trademark rights website, I see that several companies have registered trademark rights for Ultrafire.
There’s only one manufacturer for products like fenix, acebeam, and convoy, so I don’t understand why so many companies have registered trademarks for Ultrafire.
My guess as to why there are different companies using the Ultrafire name would be they were one of the first companies selling 18650 powered flashlights and had established a name before other companies entered the market.
So ULTRAFIRE is well-known for the reasons you mention.
I think ULTRAFIRE is an essential brand when talking about flashlights.
There are several websites claiming to be official, and many ULTRAFIRE brands have registered trademarks, so it can be difficult to know which is the real ULTRAFIRE.
I think the first ULTRAFIRE to be founded can be considered the real ULTRAFIRE.