system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Last names

Reddit! Can you explain to me how I, a Haitian. Ended up with the last name Charlmagne. As far as I can trace back, the ancestors I can trace were also all black, so how did Charlemagne end up in the mix. And does it mean there's some relation to Charlemagne the King?
gpt
Charlemagne is a relatively common last name in France. Haiti was previously a French colony. As such, there will be a connection to a French person with the last name of Charlemagne somewhere in your family's history. They might be an ancestor, or the name might have come from a French slave-owner during the colonial period.