Avoid giving characters similar names, such as those starting with the same letter or sound, or names that rhyme. Using unique or unusual names makes them easier for readers to keep track of and more memorable as well.

For example, Shelley and Sherry; Allen and Andrew; Michelle and Rochelle; Allison and Madison; Jerry and Terry; Kelly and Kerry, etc. can cause confusion, especially if they’re minor characters who aren’t around for the entire story. Any time a reader has to stop and figure out who’s what it breaks the story flow.

On the other hand, unique names in and of themselves make a person stand out. Surnames are popular given names, so if you can’t think of anything else, you can always use your grandmother’s maiden name. My paternal grandmother’s surname was Jarry. Not bad for a character, unless you already have a Harry, a Barry, or a Larry. My other grandmother’s name was Gale. Another good option.