Change the "name" value of a signed Java applet

I've self-signed a java applet, so when a user views this applet in a browser, the browser will show a digital signature cannot be verified confirmation dialog. That's all ok, however the value of the "Name:" property (seen above the "Publisher:" property) of this confirmation dialog is set to something I don't remember setting when doing the signing. So my question is, where is this value coming from, and how do I change it?