Why is identity tied to a name? Identity is such a fluid construct, and the arbitrary forcing of it into First/Surname seems on one hand anglocentric, and on an

Why is identity tied to a name? Identity is such a fluid construct, and the arbitrary forcing of it into First/Surname seems on one hand anglocentric, and on another hand, trying to impose on online identity the vestiges of real-world identity that we don't need on here. I would think given the discourse around online identity (i.e. http://www.juliandibbell.com/ http://www.juliandibbell.com/ and http://www.mit.edu/~sturkle/ http://www.mit.edu/~sturkle/), including feminist discourse, socio-political, etc that we would beyond this.