Kalmar "merganser mai kaho" tana nufin nau'in agwagwa da aka sani da Lophodytes cucullatus. Wani karamin agwagi ne mai girman ruwa da ake samu a Arewacin Amurka. Kalmar “hooded” tana bayyana maɓalli na musamman ko “hoho” akan kan tsuntsun namiji, wanda za a iya ɗagawa ko saukar da shi. "Merganser" an samo shi daga kalmar Latin "mergere," ma'ana "zubawa," yana nuna halinsa na ruwa. da kankanin girmansa, da dabi’un ruwa, da kuma irin nau’in da ke kan namiji.