I used zh on files that were mine on our computer.
The z put the files at the bottom and made it easier to find the files than my initials kh.
Then when I went to e-mail kent was taken, so used zhkent. Has worked pretty good as a login as usually available.
My wife and kids had used my e-mail until lately, and they are not totally enthused about the new e-mail logins I made for them, zhrob, zhhannah, and zhross.