Elvis and Buffy are out. Dexter and Luna are in. Vetstreet.com did an analysis of over a million dog names and tracked which ones moved up the list the most since 2003. Others to make the list included Thor, Layla, Gunner, Piper, Bentley, Nala, Jax, Stella, Ace, Willow, Leo, Maya, King, Athena, Simba, Charlie, Milo and Ella. The #1 names for puppies are Bella and Max.