Castru (Tb, Sm, Cn, Ce, Sl, Vd), Castro (Cñ, Cs, Gs), El Castru (On, Si, Ct, Pr, Sl), El Castro (Ll, An, Ef, Sa, Cs), O Castro (Ss, Tr), El Questru (Ay, Ll), Castrosierra (Cn), Ricastro (Mi), Trescastru (Cn) ‘detrás del castru’, documentá “Trascastro”.