I got mine from my Xbox (original) live experience. First name is Dave so I put that into the tag field when signing up. Course Dave was taken, but it made a couple of suggestions and Seismic_dave was one of them. I thought it sounded ok and was more interested in getting the account set up rather than the name on the account. I've had it through the Xbox, Xbox 360, Ps1, ps2 and now the PS4. Never saw a reason to change, I can remember it, a key issue, the older I get.