or ME'TIUS, an old Italian name, in use both among the Sabines and Latins. It is doubtful whether Mettius or Metius is the better orthography, as we sometimes find one and sometimes the other in the best MSS. For the sake of uniformity, however, we have adopted the form Mettius in all the following names, though some of them occur with only one t.
A Dictionary of Greek and Roman biography and mythology
Smith, William
A Dictionary of Greek and Roman biography and mythology. William Smith, LLD, ed. 1890