Yes I know. And if you can point me to a single shred of evidence to this effect that isn't rumor, superstition or hearsay, I will eat my shoe.
They have a different name every time because the server doesn't allow you (or a GM) to create a character with exactly the same name as one of your previous characters connected to the same family. Remember the last Invasion where the daimon GM would try to bring his killed characters back to life, only he couldn't exactly? He had to resort to silliness like removing a single character from the original name and then pretending it was the same commander, back from the dead, in all his RPs.
I am 100% convinced that any supposition that if we kill enough of them, they'll stop coming back, is pure fantasy on the part of the players. I mean come on, we're up to what, 9th Son now? And they just keep on coming. If there was a limit, don't you think Overlord would be at least slightly more cautious about throwing them away?
Tom is playing them himself. He has complete and total power over what he calls them.
If he wanted to name them the same thing again, he would. If the code would prevent it, he could either change the code, or edit the database directly.
In your haste to explain things away as simply problems with the game, you are ignoring obvious clues that Tom is giving us about the nature of the Daimons Overlord commands.
Look at it from a more IC perspective, and don't be so cynical. Tom has been clear all along that he wanted this invasion to have a chance for us to win, and that there would be no deus ex machina.
That means that he's not just pre-determined the outcome either way: he's not going to just keep pulling Daimons out of his ass forever, and he's not just going to go away at some point because he feels like it. The one thing I've seen that has been the clearest indication of progress in the war has been the killing of the Daimon commanders and their replacement with new ones with different names.
If we kill all the Darkest Hours and they just get replaced with Even Darker Hours that command stronger troops than their predecessors, then, yeah, we'll know he's just screwing with us. And yeah, maybe killing them all will actually further Overlord's diabolical plans and let him wipe out all of Beluaterra.
But for Great Cthulhu's sake, I'd rather see that than people deciding not to kill them just because they think Tom can't respawn them with exactly the same name if he wants—or any other silly game-mechanic-based objection.
This invasion is pretty damn epic. Let it be epic, and don't try to reduce it to numbers and code.