I use recognisable usernames in places (like here) where I'm fine with my comments being linked to my real name, and less obvious ones without explicitly hiding it places where I'd prefer my comments don't show up in Google searches for my name (e.g. Reddit - if you trawl through my reddit profile, linking it to my name is easy, and it wouldn't be a problem if you found it, but I don't get a bunch of reddit comments when I Google my name), and then totally separate user names for anything I actually want to be anonymous for.

My situation is a bit unusual in that I almost certainly have a globally unique name (my last name is a corruption of an uncommon name in Norway; said corruption occurred two places independently, and there are less than 500 people with that last name in Norway, and probably about the same in the US, and to date I've seen no indication of anyone combining it with my first name), my first name plus last initial is also unusual enough that I only rarely can't get it as a username.