In IGJ, chapter 14, Duko Rigoglio mentions the Loganstone, assumed to be the lander that carried him and others to the Whorl. I don't see any speculation about this name in Moonmilk.
A logan stone is a large rock that wobbles. From the wiki for Rocking Stone:
Rocking stones (also known as
logan stones or /
logans/) are large stones <
http://en.wikipedia.org/wiki/Rock_%28geology%29> that are so finely balanced that the application of just a small force causes them to rock. They are found throughout the world. Some are man-made megaliths <
http://en.wikipedia.org/wiki/Megalith>, but others are natural, often left by glaciers. <
http://en.wikipedia.org/wiki/Glacier>
Logan or rocking stones are known in Scotland <
http://en.wikipedia.org/wiki/Scotland> sometimes as
clach-br?th. They marked locations where Scottish open-air courts <
http://en.wikipedia.org/wiki/Court> would take place. A clach-br?th is sometimes known as a judgment stone. The reason that courts were near logan stones is that the movement of stones in such formations was used to determine the guilt or innocence of those accused of serious crimes in ancient times.
The word "logan" is probably derived from the word "log", which in an English dialect means to rock. In fact, in some parts of the UK, rocking stones or logan stones are called logging stones. The word "log" might be connected with the Danish word "logre", which means to "wag a tail". Some have suggested that the word "logan" comes from a Cornish <
http://en.wikipedia.org/wiki/Cornish_language> expression for the movement that someone makes when inebriated.
I draw two correspondences from this:
(1) Being chosen/accepted for transport on the Whorl must have been seen, or may be taken, as a sort of judgment. Whether positive or negative in terms of loyalty to Typhon's family, I don't know. But the judgment connotation should fit in with the other Old Testament-connected "big ideas," such as the Whorl itself as a demiurgic Tower of Babel.
(2) There is a Dionysiac connotation here, based on the possible derivation from drunken staggering.
(3) Together, these seem to point to the Outsider.