is it going to be a blank.wordpress.com??? If so it doesn't matter too much. You could call it "Oli's Electronics Blog" That's descriptive enough.
I've purchased about a dozen domain names over the years intending to do something with them then never have. Sad thing is I keep renewing them year after year.
Actually I did just let one laps on the first. It was hard. Was one of my first and a 5 character name, but it had a number in it so I doubt anyone would want it.