Stephanie

In Having a Wailord of a Time, Stephanie was set to pick her first Pokémon from Nurse Joy in Slateport City. However, while Ash, Brock, and Max were watching over the starters, Torchic grew restless and started running around the Pokémon Center. Eventually, all the excitement caused Torchic to evolve into a Combusken.
At first, Ash and the others planned to hide the Combusken and use May's Torchic as a distraction to make it seem like nothing had happened. But, fearing Stephanie would choose Torchic, they confessed to Nurse Joy what had occurred.
Nurse Joy told Stephanie that Combusken would likely be a poor choice for a beginning trainer, so she selected Mudkip. Then Stephanie's father looked into the Treecko's eyes and fell in love with it. Nurse Joy allowed Stephanie's father to take the Treecko with him, and she decided to keep the Combusken with her at the Pokémon Center.
In the Japanese version, she was never given a name. She was only referred to as "Girl" in the credits.
Her English name, therefore, likely was inspired by her voice actress' name.