so there’s an argument in English-speaking Gundam fandom that’s been around ever since Gundam started getting dubbed: How is “GM” pronounced?
In the dub for the TV series,the Japanese “Jim” pronunciation is used; however the dubs of most if not all of the OVAs pronounce it as any English speaker would: “Jee-ehm”.
BUT!! I have evidence that the actual pronunciation is indeed “Jim”. Why? Well, let’s look to Victory Gundam…
Throughout the spinoffs in the later parts of the Universal Century we see many “descendants” of the GM, like the Jegan, the Hardygun, the Javelin, etc. But there’s a suit with a name that puts the argument to rest…

…the Jamesgun.
get it. GET IT?!
Tomino you clever bastard.