Pugilist is someone who fights with their fists.

While a Monk is as well, a Monk is also someone who has a spiritual connection to himself so deep that he can use his inner energies to heal and deal more damage outwardly. Hes also more disciplined.

In the same vein a Berserker is also a Pugilist, and a Thief, or Dancer can be a Pugilist.

Pugilist is the class, Monk is the Job. don't rename the classes, add job titles that increase specialization and reward you for doing so.

If your a Pugilist with Monk as your Job Title you get bonuses for using Monk tenant abilities like Chi-Blast.

As an added bonus of the Job Title System over Renaming Classes, both a Lancer or a Gladiator can be a Paladin with this system

As well as many other combinations.