Cavanilla is a name that has been used four times, applied to four different groups of plants. None of the names is in common use today. Names are
Cavanilla J.F.Gmel. 1792 (Dombeya or Pentapetes or Pterospermum or Trochetia in Malvaceae; impossible to equate with a modern genus because no type was ever designated)
Cavanilla Thunb. 1792 (Pyrenacantha in Icacinaceae)