In Asterix The Gaul, there is a Roman soldier who runs off to fetch a superior, and his name is mentioned as Caius Marchéopus. What is the exact pun being performed here?
Marché aux puces.
The phrase is similar in both languages, "flea" being a puce in French. I doubt the two phrases originated separately and Wikipedia suggests it was used first in French. The phrase is the same in many other European languages (Italian, German, Danish, Portuguese…) and it states also it comes from the French marché aux puces.