Hexanchus griseus shine sunan kimiyya ga jinsin shark wanda aka fi sani da "bluntnose sixgill shark." Kalmar "hexanchus" tana nufin gaskiyar cewa wannan kifin yana da tsage-tsage guda shida a gefen jikinsa, wanda shine siffa da ta bambanta shi da yawancin sauran sharks, waɗanda yawanci suna da tsaga gill guda biyar. Kalmar "griseus" kalma ce ta Latin da ke nufin "launin toka," wanda ke bayyana launin fata na shark.