Charlemagne is the French form of Charles the Great, the 8th-century Frankish king who united most of Western Europe and is considered the founding figure of both France and Germany. As a pet name, it represents the maximum expression of the "grand historical figure on a small domestic animal" joke: four syllables of medieval authority attached to a creature who is probably begging for treats at this exact moment.
The Grandeur-Absurdity Gap
Pet naming at this register (Charlemagne, Napoleon, Genghis, Ptolemy) operates entirely on the gap between the name's historical weight and the pet's actual priorities. The joke is clearest on small dogs and cats who have zero awareness of their namesake's legacy and maximum confidence in their own importance within the household. French Bulldogs are the canonical pairing: a French emperor's name on France's most fashionable modern breed.
The Nickname Solution
Charlie is the obvious working nickname: warm, casual, common enough not to require explanation. This is the same two-name strategy that makes Roosevelt (Roosie), Washington (Wash), and similar long formal names functional in daily use. Charlemagne on the vet records; Charlie in the park. The human name Charles gives context for the name family's ongoing appeal.
The Counter-Reading: Maximum Syllables, Maximum Explanation
Four syllables requires a genuine commitment to consistency. Most owners default to Charlie within weeks. If the owner's goal is to actually use the full name, they need to practice the four-syllable version as a recall cue before the abbreviation becomes default. At 32 registrations, Charlemagne is a self-aware, deliberately extreme naming choice.