Vampire Houses

Judging by Samson's responses on BloodCopy these may not all be houses, maybe another race?

"Virapalien" (Spelling confirmed by Samson on BloodCopy, but said he didn't know who they were, may not be a house?)
"Lindwurm" (Spelling confirmed by Samson, Old Norse linnormr 'constrictor snake', Norwegian lindorm 'serpent', German Lindwurm 'dragon')
"Tenebrae" (Also associated with Persia, and spelling confirmed by Samson, Latin for Shadows)
"House of Euxine" (Spelling confirmed by Samson, called them dangerous, Greek means 'Inhospitable')

That's all we know so far.