Katha-1-1-1-oṃ uśan ha

Sri Shankara’s Commentary (Bhashya) translated by S. Sitarama Sastri

Ushan, desiring for the fruits of the sacrifice. Ha and vai are two particles which have the force of recalling to mind what had passed. Vâjasravasah: vâja means food, srava means fame; the compound, therefore, means one who had attained fame by the giving of food; or, the compound may be a proper name. The son of Vâjasrava is Vâjasravasah. Vâjasravasah, it is said, performed the Visvajit sacrifice (in which all is given away) desirous of its fruits. During the sacrifice he gave away all his wealth. The performer of the sacrifice had a son named Nachikêtas.

Links
Various resources on the Kathopanishad
Upanishad Series – Katopanishad Commentary by Swami Chinmayananda