It is.

Only Sam, Jane, and Callie have middle names. Jane's full name is Lady Jane Grey. I'm not sure if Jane or Grey is her middle name. I call her Jane or "li'l girl".

Sam's full name is Samwise Rory Beauregard Gamgee, the Red. I call him Sam.

Callie's full name is Calla Lily. Sometimes she is called Callie, sometimes Lily.