In Crystal, the female protagonist has blue hair that is worn in two ponytails. Her official name is Crystal or Kris.

But of course, you can either give it your own name or choose from the 4 options.

The options are:

Kris

Amanda

Juana

Jodi

In another game, Pokemon XD: Gale of Darkness, Michael (the protagonist) has a little sister. She has blue hair worn in two ponytails and is named Jodi.

Conclusion: ???