What is the scientific name for the cassowary?

The genus name of the cassowary is Casuarius.

There are three species of cassowary:

Southern cassowary, or double-wattled cassowary (Casuarius casuarius)

Northern cassowary, or single-wattled cassowary (Casuarius casuarius)

Bennett's cassowary, or dwarf cassowary (Casuarius bennetti)