Per Britannica ( https://www.britannica.com/biography/Miguel-de-Cervantes/Translations ):
"...he had an affair with a young married woman named Ana de Villafranca (or Ana Franca de Rojas), the fruit of which was a daughter. Isabel de Saavedra, Cervantes's only child, was later brought up in her father's household."
So unfortunately, you cannot be a direct male-line descendant of Miguel.