Daniel wrote:
"Can you tell me where I can read more about the wondrous "Nordic spirit" in
GA 121? I seem to have missed it."

Peter Staudenmaier:
The latter half of the book is about the spiritual mysteries of Nordic man.
There you can read all about "the Germanic and Nordic Folk Spirit" (e.g. p.
162 or p. 168), the "Folk Spirit of the North" (p. 172), and "the Folk
Spirit who rules over the Northern lands." (p. 183)

Daniel:
The latter half of the book is about Norse Mythology (as the subtitle
implies), and not this "Nordic man" that you mention. "Nordic man" is
mentioned once on p. 171, but is hardly half the book! Mostly, Steiner talks
about norse culture, not norse physiology. And yes, there are a few
references that you mention above to the spirit who bears the names you have
listed above (and you seem to have found most of them). Whether four
mentions in two out of 11 lectures really demonstrates a central placement
is, of course, debateable.

Daniel Hindes