lastb and found login attemps that used my username. I doubt they would guess my password, but my 4-lowercase-letter dictionary username should probably be made more complex.
I'm going to add the first letter of my last name to it with
usermod -l login-name old-name
My user belongs to 3 groups other than itself. Will those change automatically? Will ownership of files not in the home directory reflect the new login name?
EDIT: Also, will the user's group name change to match the new username? Will the change take a long time if my user has many files?