"Mariko", "Erista", "Drake": SOC code names
"Odin", "Modin", "Vali", "Frig": Motherboard code names.
"Aula", "Hoag", "Icosa", "Iowa", "Calcio", "Copper": Console code names
We've talked about the Comic Book naming convention for SOCs.
The motherboard code names are obviously norse, but they also probably don't refer to shipping motherboards? These are test boards used by Nvidia during development, which Horizon needs to detect for things like RAM timings and other non-SOC hardware specific configuration data. "Loki" for example is the name of the motherboard in the Nvidia Shield Portable
The console code names are Nintendo-internal, and are interesting because they actually have meaning. Icosa and Iowa are both "integrated" machines, meaning they can Switch - they are the V1 and the V2 Switch respectively. "Copper" and "Calcio" are both "console" devices - these have support for being connected to an external monitor without the dock, but they are also digital only machines and are almost definitely machines sitting on developer's desks at NCL offices, doing dev work. "Hoag" is the Lite a "handheld" only console.
"Aula" is unusual in this regard as it implies a new form factor by the naming convention.
If there are future "leaks" with code names, it will be useful to use this information as a gut check on how accurate they are, and what they might imply about both the hardware and the leak's source. There are, in fact, a few words that if they popped up in a leak would get my immediate attention, but I have yet to see surface.