This might be a stupid question but who chooses the name of trades? Like, obviously they're normally named after the bigger arcs in the book, but just wanted to know if that tends to be a marketing call or something the writer chooses?

Normally the trade collections use the name of the biggest arc in the collection. However, sometimes, when that title feels a little nondescript, they will ask for an alternative. I had an arc called “Whitewater,” and they asked for something more evocative. I came up with “Dead of Winter.”  It’s a collaboration.