I think its a good idea to have this page; even if the actual name wasn't used yet, they've mentioned the "Storm Kings"; as you said by extension "Harren the Black" was mentioned but we have articles on "House Hoare" as a result -- using "House Durrandon" fits standardized form for articles much better.

Originally I was hesitant on the question of "Durrandon" vs "Durrendon", until it was pointed out to me that its a patronymic for "Durran". I think the problem was that the original report we got this from was an oral report from a GRRM reading of World of Ice and Fire, and the reporter just didn't notice the connection and wrote it down phonetically (we need to correct the few references to "Durrendon" we have).--The Dragon Demands (talk) 01:45, December 4, 2012 (UTC)