I've had my nickname for 10 years. I needed a new domain name, back when I was selling my mandala.com domain to a mandala artist who needed it more than I did.
I sat down and considered who I am. I was studying yoga shortly before that with a past partner, and I always loved surfing as a teenager growing up, vacationing in S. Calf.
But I took that metaphorically, to mean "yogi" as "teacher" or master. And surfing, was just surfing the internet.
Since I was on the internet much longer than just about anyone I had ever met, having had an email address since 1983 at Intel, I felt surfyogi was a good description of someone that surfs the internet for a living.