The golem seen briefly in the prologue turns out to be Fall's childhood friend (and/or "friend"? but eventually
friend) Reginald.
This reminded me of the Pokémon series, which features several golem-like Pokémon called Regirock, Regice, Regiseel, and Regigigas. And also Regieleki and Regidrago, which I only just now found out about.
Pokémon are almost always given thematic and/or punny names. There's a mushroom Pokémon named Amoongus (get it? fungus among us?). Pikachu is famously named from "pikapika" (sparkling, allegedly an onomatopoeia for a spark) and "chuchu" (an onomatopoeia for a mouse's squeaking or a child's term for a mouse itself). It evolves into Raichu, from "rai" meaning thunder, lightning/thunderbolt, or a thunder god. There's a seal Pokémon called Seel, and another, rounder one called Spheal (sphere+seal).
But the Pokémon wiki doesn't have anything to say about the Regi- prefix in relation to golems, only saying that it's from "regis," Latin for "royal."
And Reginald's CO, also a golem, was called something along the lines of King George. So: Is there some connection between golems and royalty and/or the Regi- prefix, or is that just a coincidence?