When I was young, I was not interested in any kind of social media, but my mother asked me to choose a name for a Facebook account she needed for games (really...). So Alex is similar to my real name and Cadwish is a portmanteau word (Cadoizo and wish; Cadoizo is the french name of Delibird, a pokemon I don't like).
So it's a username I didn't want, composed of a pokemon I don't like. But I like this username, because I'm used to it now.