Well, if it's Kerra Isle I've killed all the named except for the SK epic mob at least once. Even the damn fish named! Edit: There's one more pretty hidden named I haven't tried spawning yet. I'm on the case!
Only briefly. Jelquar is a good candidate there and was a weapon dropper previously. He's tough to spawn, has 2 (maybe 3?) PHs and he's hostile to other stuff in the zone. You kinda need to dedicate two toons to it, or be real fast.
Coming up super empty in Kerra Isle. Erud's Crossing I'm not able to get the PH or the erudite madman to spawn, so I don't know what's going on there. Scraping the barrel here!
4 hours in Erud's Crossing (Couldn't get PH or named to spawn) and 8 in Kerra (Killed everything at least once, fish named only 1 time). Someone else is welcome to explore there.
I went sword-fishing in the PoN hobgoblin tunnels a few times. Nothing turned up, but I bet at least one of the nameds in there can drop swords.
I also suspect that at least one named in the PoJ grallok caves can drop swords. There are half a dozen named in there; one of em's gotta be a dropper.
I've cleared the Liberated Citadel of Runnyeye about 10 or so times now? 8 Lord Picklaws, 2 battle masters, but none of the third named spawn. I've cleared The Gorge of King Xorbb 8 or so times now? I think 7 named eyeballs, but th emiddle spawn seems to be the more bigger named, and he doesn't share the 6 minute timer of his buddies.
Hints from Robregen so far (put together from various sources): "The weapon droppers in PoInnovation havent been found. There's another one to be found in ponightmare and podisease. Seems like there's one in a forgotten zone." Hint from Elroz on page 1 of this post: "I'll give a hint for a couple NPCs. I believe they are the only 2 NPC's with dialogue regarding "phat lewtz""
one of the "phat lewtz" npcs was found and killed, Lithiniath in PoM. The other is still at large, although I think most people know it. Lithiniath actually tells you to ask this other NPC about "phat lewtz".
I'm placing my bet on the forgotten zone is gonna be Runnyeye, and the mob being The Sporali Moldmaster. Looks like there's 6 Sporali Defenders on a ~30m respawn timer, and the other sporali are on like a 20m timer. Then there's one spawn in a 4way area that's also a Sporali Defender that's on a 1 hour timer. I got one Moldmaster to spawn off one of the other 30m spawn timers. The 1h respawn timer gave me 5 place holder Defender mobs. I'll check again tomorrow.