Throbble and I have found a few items that seem to be unique, in that they have specific names but aren't in the category of "legendary" or "set". The items themselves have a blue name that is always the same and (I think) drop from specific randomly spawned locations or enemies. The same item can spawn even if you already have it in your inventory/stash and they can have different random properties though I believe they are always of the same level.
I've been holding on to these items in case they serve some purpose and I thought I'd post information about them as I discover it. (I'll update the information as I get it.)
Named Item List(added 7/2/12)Named Item LocationsGriswold's Worn EdgeRakanishu's Blade (added 6/25/12)Splintered Oar (added 7/2/12)Found on Unique Cultist
Urzel Mordreg during the
The Doom in Wortham quest. (Hell difficulty only?)
What are they for?Rakanishu's Blade-420
EDIT: 6/25/12 Added Rakanishu's Blade location.
EDIT: 7/2/12 Added Splintered Oar item and location.