"Cavalier" is chiefly associated with the Royalist supporters of King Charles I in his struggle with Parliament in the English Civil War. It first appears as a term of reproach and contempt, applied to the followers of King Charles I in June 1642:

Based on this passage, another name for a cavalier during the english civil war? Let's think fast. Stream of consciousness:
To answer this question, we should know that: "Cavalier" is chiefly associated with the Royalist supporters of King Charles I in his struggle with Parliament in the English Civil War. So the final answer is the Royalist supporters of King Charles I.