Maybe not with ChatSetAttr? That name is stored as "character_name" on the character sheet, but IIRC it's not actually an attribute on the sheet, so it might not be accessible in that way. !setattr --sel --character_name|newname should in theory set a selected character's name to "newname", but didn't get it to work. But maybe TokenMod, which can edit things related to tokens and the name or displayed name, can be a good enough workaround? Do you want to have a macro to change the name displayed on the Journal page, or what is the reason you want the change? There might be other ways to achieve your end goal, if this is just a means to an end.