is this:

Who

Kiera
Kiara
.
.
Sokera
Sekera

And there is another group of two names that are one letter off that group often(can't remember off the top of my head).

Kindof makes me sick to my stomach. I would say if you were going to do that, at least don't log in right next to eachother more often than not...or at least choose names that are a bit more different....but that advice would be invalid...because three groups of people have made it to hero range doing just that.