The admins where I work use “Changeme3456”. Security geniuses they are.
When I was teaching secure networking for NSA and others as computers became more common place, we would get preconfigured computers to se - they came with a standard PW of “Change-me” - I took over the area a year later and the idiots still had the same passwords on them. Fortunately, they were n a SCIF and air-gapped at the time - but I did hold some training sessions on security....