It's been forever since I've done much usenet, so I apologize if my netiquette is rusty. I'm pretty sure I know how the samurai name for food ration got to be gunyoki, which isn't actually japanese for anything like the game claims. I didn't want to necro a decade old thread, but this is the one I got inspiration from.
https://groups.google.com/g/rec.games.roguelike.nethack/c/7MLdsjU1lAU/m/viUW48UPYG0J

There's a manuscript writen by Sadatake Ise, in the 18th century, called Gun'yōki (軍用記), which is translated as "Samurai Customs" or more literally "Military Notes". oh, caveat: I don't speak or read japanese.
There's a copy of the manuscript online, and two pages have a diagram that looks like it could be a place setting with chestnuts and strips of seaweed, strips of abalone, and sake.

https://archive.wul.waseda.ac.jp/kosho/i04/i04_02478/i04_02478_0096/
here's pdfs and jpg versions of the manuscript. In volume 3, pages 48 and 50 are the diagrams. On page 48, the section of text above the upper righthand corner of the diagram looks like it begins with 勝栗 (kachi-guri, dried chestnut, wordplay on "victory"), and the test to the right of the lower righthand corner of the diagram looks like it begins with 昆布 (kombu, kelp strips, wordplay on "be happy"). The test below the lower lefthand corner begins with 盃, which is sake cup(?). relied on google image translate for that last one.

What I expect happened was someone looked up what samurai ate, and found an article that had the description from the book, and at the end had Gunyoki in parentheses at the end, as a citation. But the dev mistook it for the name of the meal.

anyways, my interest was piqued again recently about the term, and I'm satisfied. I didn't see any more recent threads than that one a decade ago, so I thought I'd share, in case someone else is curious (or might be 10 years from now).