Raquel's concept art

Raquel G. Applegate is the future daughter of Arnaud G. Vasquez and Raquel Applegate. She helps her father out in their coffee shop. She is not given an exact name at the end of the game, however the Japanese novel based off of the game identifies her as "Little Raquel G. Applegate". Since she is named after both of her parents, it can be inferred that the "G" her middle name stands for is "Gray", as it was in her father's name.
Mia Wild Arms 4 ending

A screenshot of Little Raquel in Wild Arms 4's ending sequence.