We've commented on this at II. There are a couple of classes of folk here -- those who stick to an ID and those who've hopped. The hoppers have their reasons, some have tried to obscure their identity, some haven't. In this particular group, the obscuring doesn't last too long, there are personality traits that show up pretty quickly. The reasons seem to basically break down into two schools: trying to change (or hide) from a past ID, and somewhat incidental changes. As with other examples of name changes (think the KGB, now know as something else, various lables applied to dark-complected persons in the US, corporate name changes (eg: Acenture, Phillip Morris, Experian (formerly TRW), and other institutional or cultural transitions), changing a name doesn't change the fundamental nature of the beast.
The incidental changes tend to fall to other reasons. Scott's now know as admin, because, er, he is (personally I'd mildely prefer he posted as ScottA or malraux, and reserved "admin" for admin purposes, but it's not a big deal). Ashton's been known as "aston" or "ashton2" variously , which is pretty easy to figure out (forgotten passwords, Mr. Brown?). A few folk in professional life have elected not to use their professional names to represent themselves as a mild bit of protection, but haven't gone out of their way to hide who they are.
As I've said before, being well-known has generally served me well, and I've managed to deal with the occasional critics I've encountered. But that's a personal choice.
I'm very confused as to why ones partner would have any say on the matter.