Apellido Lugo

My biological father was Lugo. He was born in San Jose de La Paz, Jalisco but that last name is not originally from the Cienega region of Jalisco since my great great grandfather was born in San Pedro Piedra Gorda (Manuel Doblado, Guanajuato and then moved to Jalisco when he married in the 1870’s . I believe they are originally from Guanajuato since the last name Lugo is very common around San Miguel Allende and Leon. Does anyone know who is the patriarch of this last name in Mexico. I’ve heard rumors that all the Lugos descend from a early Spanish settler who was a slave trader in a Leon, Guanajuato. Any help on this surname would be greatly appreciated.