Final answer:
Without additional context or background information, it's not possible to answer why Kiara, Rob Washington's sister, wants to be called by a different name.
Step-by-step explanation:
The question does not provide sufficient context to answer factually and accurately as it pertains to Rob Washington's sister, Kiara, wanting to be called by a different name. It sounds like this could be a question related to a specific narrative or story, which could be part of a social studies or English curriculum. Without the context of the story or information that provides background on who Rob Washington and Kiara are, an accurate answer cannot be given. Individuals may choose to be called by a different name for a variety of personal reasons. It's important to respect one's choice of the name they wish to be identified by.