So many things have been retconned or changed in the last two decades and change that this setting has been around for... but for some reason certain names have proven immune to any sort of common sense.
Any name that is formed from two nouns smashed together is already facing an uphill battle to not sound ridiculous. "Deathfire" is just idiotic. It's right up there with the attempt to say that Lion El'Jonson, a name that served as a tribute to the poet Lionel Johnson (who wrote the poem "Dark Angel"), really means "The Lion, the Son of the Forest". I mean, I'm sure there's also a Calibanite out there whose last name is El'Peterson, which means "the Son of the Mountain" or whatever, right?
Jesus, just do away with those names. Change them. Pretend they never existed. Whatever.