Why do they need names?
If you're going to be writing up a report of the experiment, it would just make more sense to have snail #1, snail #2 and so forth, or was the making of names a requirement?
you should name them subject and add a number.
Boys: Slimey, Speedy, Lucky, Zeus, Hercules, Leonard, Skydragon, and Goldy. I can not think of any other good ones right now.