Spoiler:You get the clue for Windprey being called Windlapse from a book called Wellsmoth, which you can find in the drawer of Nolder's desk. You then need to combine that clue with the one about Samuel William Poer's tomb. I don't quite remember where that one comes from though.
Edit:You get the clue about Poer's tomb in the attic of Ivar's cabin.
but.....
Spoiler:When I go to cementary I cannot find any records of Samuel William Poer and I'm preaty much desperate. I got insect and leaves from figure and I'm waithing for the call from Arthur.