Often you may find the need to populate a course with sample users so your students can log onto a course and experiment around.
Having sample users is also a great solution for demo courses when you want to allow students to experience hands-on a specific technique.
I discovered a fun list of names at http://www.ethanwiner.com/funnames.html. Many of them are very inappropriate for a lab situation, but I was able to cull about 25 very safe ones from the list.
Here are a few examples: Missy Sippy, Peg Legg, Marshall Law, Mary Christmas, and Sal A. Mander.