When it comes to mockups where I need names I typically fall back on characters from movies, famous people or whatever random thing comes to mind. Names that have made appearances in my internal mockups are everything from Betty White, Justin Timberlake, Minions, Walter Bishop, Olivia Dunham… anything weird I don’t mind staring at.
Behold the brilliant project uinames.com that randomly generates male and female names. Looking at the links in the about, the names are pulled from common names over the last 100 years from the social security database and common surnames in the US. This solves the problem when you need to show a mockup beyond the internal team that is in on your practical naming jokes or when a design is customer facing. It is an interesting idea, I like it.