A gargoyle (crafted as a construct to protect a religious order) in the campaign I'm currently in is called Emet, which to my understanding is how אמת is pronounced (translating to truth). In the myth, removing א from their name makes it מת, death, and the golem dies. The pronunciation changes from Emet to Met and I'm always a little interested to see if this will pop up in some from in the game.
You are correct, it is pronounced Emet. In the golem story the word Emet or Met is just the activation word, the golems is actually alive because the full name of the lord (which is like 200~ letters) was carved into a tablet and put inside the golem.
Vav is a product of ashkenaszi pronunciations due to yiddish. Originally it's Waw. And the multiple names for God thing comes from Kaballah which certain groups of Jews actually do reject as mysticism and not originally being grom Judaism but added in after the second temple period due to the Zohar. Certain groups such as the Kairaites for example, even reject the Talmud, Mishnah, and Kaballah and stick to Torah and Tanakh only