(Harlowe) Help with setting variables to random occurances

So in the game I've got going, I'm trying to give the character a generated name with random letters by using a series of (either:) macros. I want that name to be used in a later passage, so I'm trying to set it to the variable $name. Here's an abbreviated version of what I'm writing:

My name is (set: $name to "(either: "A", "B")(either: "c", "d")(either: "e", "f")")

Around it, I have bold, italics, and then passage to a different page, but I didn't think those things were relevant. The error message I'm getting is "missing ) after argument list", but I don't think I'm missing any parentheses. What am I doing wrong?

Thanks!