Cynodon is derived from kyon means a dog and odous means tooth. Thus, it means Dog's tooth. Dactylon comes from a Greek word dactylos means finger which refers to the shape of the inflorescence.
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 Gramineae is also exempted and conserved under 'Nomina Conservanda' because of their constant use for a long time.