Cenchrus comes from a Greek word kenchros means a kind of millet and biflorus referes to 2 flowered.
According to the Rules of ICBN the names of the families should end in -aceae. Thus the new name for the family Gramineae became Poaceae. However, the name Gramineaeis also exempted and conserved under 'Nomina Conservanda' because of their constant use for a long time.