I've been skimming a bit and I don't think I've missed a mention of this but forgive me if I'm wrong.
This isn't an individual business name as such, but in the UK the people that make headstones for graves are called "monumental sculptors". It took me ages to figure out what they were and I still can't help but think of "monumental" as meaning "huge" or "exceptionally great" instead of literally, "monuments".