(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 [1860], that name being proposed for Entomothera as used by Reichenbach [1851] but not Entomothera of Horsfield [1822]. 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). 

Search for more names on the Key to Scientific Names in Ornithology by James A. Jobling.
Recommended citation
Jobling, J. A. (2018). Key to Scientific Names in Ornithology. In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.) (2018). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from on 15 December 2018).