Jules Verne’s use of “stewart” instead of “steward” was correct for his time, particularly in French usage. In the 19th century, French authors occasionally adapted English terms to their own phonetics or orthography. While “steward” is the standard English spelling, “stewart” might have been a common alternative in French texts to reflect the pronunciation or a perceived anglicized flair.
In English, this can be translated as “Servant on board a steamer”, “Domestic worker on a steamship” or “Steward on a steamer”
The choice of translation depends on the context and tone of the text. “Servant” or “domestic worker” highlights the menial or service-oriented role, while “steward” is more precise in nautical terminology, referring to a crew member responsible for passengers’ care or provisions.