It seems that blogging about origins of domain names is in fashion among Japanese bloggers, which was suggested by kaminogoya-san at this entry: "ドメイン名の由来を書いてみる - 2xup.org". I'll also take after them to catch up.
I run some domain names for several websites.
kentarok.org is for some kind of personal things like blog, code repository, repository viewer and task management tool, and some documents (it's now empty, though...). As you easily recognize, it was named after my own name, Kentaro Kuribayashi.
antipop.gs, which is obsolete but will still work until next year or so, was replaced by kentarok.org described above. It was the first domain name I took. The story about the domain name is too long to tell whole of it, so I'll explain it as shortly as I can.
When I took a procedure for connecting to the Internet for the first time and was needed to choose some phrase for my e-mail account name, I hadn't thought about it at all. Since no good idea came out to me then, I took a name from a Hip Hop group called Antipop Consortium. I was just listening to their music then. So, I started using the name, antipop, in various occasion: domain name, IDs for some websites, etc.
simpleandclean.jp was named after a song of Hikaru Utada, "Simple and Clean", which is English version of "光", but not literally. I'm an enthusiastic fan of her, and love the song the most of her works. simpleandclean.jp now hosts only some experimental things of mine so far, I'll offer something usefull things there.
I have also much more domain names except them. There may be a chance to write about them some time or other.