It is named after the Marrucini, an ancient Italian tribe, and the namesake of the comune of San Martino sulla Marrucina.
Silo was given command of the Marsic group (Marsi, Paeligni, Vestini, Marrucini, Picentes, Frentani), whereas his consular colleague Gaius Papius Mutilus was given command of the Samnite group.