Middle name

Melanie Bush claimed that discretion was her middle name. (TV: Delta and the Bannermen)

The Eleventh Doctor suggested that "convieniently timed" was his middle name. (COMIC: Assimilation²) Later, he claimed that bad penny was his middle name. (TV: The God Complex)

Brian Williams claimed that diligence was his middle name. (TV: The Power of Three)

Karl Wright's middle name was Brian. (TV: The Woman Who Fell to Earth)