(syn. Halcyon Ϯ White-breasted Kingfisher H. smyrnensis) Gr. πλησιος plēsios near, close to < πελας pelas near < πελαζω pelazō to bring near; genus Halcyon Swainson, 1821, kingfisher; "This group was called Entomobia by Cabanis and Heine , that name being proposed for Entomothera as used by Reichenbach  but not Entomothera of Horsfield . I note, however, that Entomobia is preoccupied by A. G. Costa, 1846, so that a new name is necessary for this well-marked genus. I herewith propose PLESIALCYON gen. nov. and designate Alcedo smyrnensis Linné as type." (Mathews 1918).