A Microsoft file hosting and synchronization service.
Same for me. Interestingly one of the shared folders has a different name on Onedrive accounts the folder is shared to (i.e. the name plus a number "LEORA-001457").
I think this occurred when I was trying some workarounds previously, but the aftereffects remain. Unsurprisingly, the obvious ways to rename this don't work, but I'd be curious to know if there is another way too fix this, short of resharing the folder. Resharing the folder would probably go fine, but I am loathe to try that because the last time I tried it (in an early attempt to fix the problem) it reset all the "cloud only settings" and filled up my local HD.