Ruby Diamond

Ruby Diamond is the firstborn daughter of Gwen Shepherd and Gideon de Villiers, two English time travelers. Through her parents, Ruby inherited a time-travel gene, although she can't use her powers to the full.

Etymology
Ruby's name is entirely derived from her parents' occupation. A ruby ​​is her mother's gemstone in the Circle of the Twelve, while a diamond is the one of her father. Hiding from the people who could hurt them, her parents adopted the surname "Diamond" (just like Gwen's biological parents once did), and gave the name Ruby to their firstborn daughter, so that both of the time travelers are honored essentially.

As for the middle name, Ruby got it from her adoptive grandmother, Grace Shepherd, because, no matter what, she's always loved Ruby's mom and helped her in everything.