Kalmar "genus Psophocarpus" tana nufin rabe-raben kimiyance na jinsin tsiro na leguminous a cikin dangin Fabaceae, wanda aka fi sani da wake mai fuka-fuki ko kuma wake. Wannan jinsin ya haɗa da ƙananan nau'ikan tsire-tsire masu hawa waɗanda suke asali zuwa yankuna masu zafi na Asiya da Afirka. Sunan "Psophocarpus" ya samo asali ne daga kalmomin Helenanci "psophos," ma'anar tsatsa, da "karpos," ma'anar 'ya'yan itace, yana nufin sautin da kwas ɗin iri ke yi lokacin da aka girgiza su.