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Back in the early days (1988-ish) when I knew I one day wanted to be a published author, I decided on the pen name 'Charles Brass'. Brass is part of my actual last name, and in the bookstores at the time, Brass was between Bradley and Brin in the Science Fiction/Fantasy section (two well-known authors).
Fast-forward a decade or so when the internet was really becoming a thing. I tried to secure the name CharlesBrass, but it was taken. Then I tried CBrass. But it too was taken. So... I tried Seabrass (as in C. Brass). And lo! It was mine!
So, since then, the majority of my online presence has been seabrass.something. Now I also use charlesbrassMN (my email address here is charlesbrassMN@gmailcom). And that is how I came to use 'Seabrass' in my little online world.