We named ours after our blind cat, Musetta. She would walk in straight lines until she met a wall, at which point she would turn and continue in another straight line. She had recently died when we got our first Roomba, so it was like reincarnation to us lol.
Both seeing this question, and seeing how many people apparently have cleaning robots, is making me realize I live in more futuristic times than I thought. I remember people getting exited about Roombas when I was very young, but not having heard much about them for years apart from the occasional video of cats messing with one, I sorta must've assumed they weren't really good enough yet to be common and had never thought to look into them
Pleco. I have a couple freshwater fish tanks and the plecostomus is a common algae eater used to keep tanks clean. So I named my robot vacuum Pleco lol.
Ours is named Rachel because once a long time ago I had a dream that my bf cheated on me with someone named Rachel so now we always joke about Rachel doing things around our house when I'm not home. She's been slacking a lot lately though, he'll have to get a new girlfriend soon.
"Our Maya", because that's the name of my grandmother's cleaning-lady we never met her, but we heard probably more stories about "her maya" than about my grandfather.
Mine are named after ATLA characters. Vacuum is Aang, mopper is Katara, litter robot is Lin Beifong (it has clay litter; the previous iteration was Toph), and the cat feeder is Lau Gan-Lan.
Edit: I remember now. Fromsoft games are a little heavy handed with the online name censorship, and there was a streamer my fiance and I watch that was playing with someone who's name was heavily censored. One of the suggested names from the streamers was "Grandpa Suckem" and my fiance and I found it hilarious.
Ours is named Hairy II, because he picks up so much cat hair. All credit to my aunt for the name, though. She had a robot named Hairy before we did, and we just co-opted the name.
"Ons moeder", which translates to something like "Our mom".
With the idea that if the robot cleans half as good as my mom does, the house will be clean enough to live in.
Sir Bob II because the first robot vacuum we had was a BobSweep named Bob, naturally, so when we upgraded to a Roomba we wanted to name it Bob II and the Sir just seemed to fit.