Quoting David Marjanovic <david.marjanovic@gmx.at>:
"Lognko" (odd as it looks) brings up a number of results, too. I don't know for sure, but I'd be willing to bet that there isn't a strongly standardized spelling system for the Mapuche/Mapuce language.
No, there isn't, but the sound in question does seem to be the one that occurs twice in "singing", and I don't see why anyone would want to write that gn.
(BTW, the language calls itself Mapudungun.)
http://en.wikipedia.org/wiki/Mapudungun_phonology
-- Nick Pharris Department of Linguistics University of Michigan
"Creativity is the sudden cessation of stupidity." --Edwin H. Land