I could do Varlet, maybe? Though its connection to Valet, historically speaking, is really pronounced.the only change i don't like here is "knave". it sounds like an alternative rogue. ironically, i think "varlet" sounds better.
Blackguard would also work, of course, as a callback to the 3e Prestige class without being an explicit update.
Either would definitely be better than a Skamelar (Parasite, Scrounger) or a Churl (one step above a slave in the social ladder).
Y'know. There's options. I mostly just want whatever it is to be a disparagement 'cause I feel that would help unite them, thematically, with the other insult-based classes.