For Lost Cairns of the Savages I have done a ton of digging into Inuit, Tlingit, esquimaux, as well as Apache, Commanche and Cherokee folk lore. I have found quite a few that I am incorporating into that adventure too... 

Not to mention all of the rituals and burial rites of those early stone age and native american tribes-people. Interesting stuff as well as great fodder for game!

BlackKnight wrote:

I'm finding that there are a bunch more names of monsters,

Just some Examples (Scandinavian):
Jötnar: Giants (General term for all Giants)
Eldjötnar: Are Fire Giants
Hrimpursar: Are Frost Giants
Sjórisar: Are Sea Giants
Trow or Troll: is actually the equal of a "hill" giant, Calling someone a Half-Troll (or Trow) is the equal of calling them a big clumsy oaf...
Draugr: are Huge Strong undead men, Black and bloated, that roam or guard places (like important Tombs, Ruins, etc).

There are many other examples are in other cultures.

As Hyperborea is kind of a Spawn of ancient earth, All of the peoples in it are from ancient earth (or fictional ancient earth at least). I'm digging through a lot of documentation of Myth and lore from different cultures (Mostly Scandinavian as I'm writing a module that is a focus on that culture). Some of the monsters in the main book have some names, has anyone tried to put together any more "alternate" names for the monsters? I know calling them alternate names in games could add a significant amount of flavor to a game. The unknown always adds anticipation on the player's side. 

Very interesting stuff...

Not done much, but.. since I from Scotland, my interest may be for the Kelts, but also have been studying the various Tlingit, Lapps, Yakuts and Esquimaux cultures also, trying to get some word translations, but it a little vague at moment. Also Mongol which I use for a small group that has entered Hyperborea.

Athach (Keltic) = Giant.

Samh (Keltic): = Giant or god (I using this term for Helios), it can also mean warrior (think source word), savage, thug, but I not use the later terms for word, too many dialect changes from primitives changing a word to suit themselves.