Huh. Been pronouncing it in my head as "dang!" (like the "expletive") all this time
https://jargon-file.org/archive/jargon-1.5.0.dos.txt
Login names are often used as nicknames, pronounce[d] if possible and spelled if necessary. My wife and I met at MIT, and she still calls me "Gliss", because my login name was GLS. "Guy" sounds very weird to her.
* as a publisher or a subscriber, and to some extent even as a reader