Nachiketa, the boy and a central character in the Katha Upanishad legend, similarly, has closely related words with roots and meanings relevant to the text.
Like Taittiriya Upanishad of Yajurveda, each section of the Katha Upanishad is called a Valli (वल्ली), which literally means a medicinal vine-like climbing plant that grows independently yet is attached to a main tree.