concern from my side as well at some point, But The name comes from audio “stems” and the multitrack “deck” interface, but I understand that it can be confused with Steam Deck or Stream Deck. There is no affiliation with Valve or Elgato, and I’ll take any legitimate trademark concern seriously. Naming things really is the hardest problem in software. :)

For overall reference:

"In audio production, a stem is a discrete or grouped collection of audio sources mixed together, usually by one person, to be dealt with downstream as one unit. A single stem may be delivered in mono, stereo, or in multiple tracks for surround sound."