So this is good news! 
I was panicking but when things get weird on my computer I get a tad OCD and dig too deep I think looking for problems. The unknown user is no there now, so I am not bothered by it. I had been transferring files from my home network pc, could that have caused it? Running delfix now. Should be go to go then, right? I’ll check back in if troubles persist.
Thank you both SO MUCH! 