And then there are common names for birds which might be the same name for entirely different species.
From Clements, "Birds of the World, A Check List", 4th ed. (Which is the one I have.), I have found the following birds with the same common name. It can get a little confusing. Perhaps some of these have been changed in a later edition(s). I have not checked them all out yet.
Bare-eyed Thrush, Turdus tephronotus, (Kenya) XU208
Bare-eyed Thrush, Turdus nudigenis, (South America) XU310
Black-throated Robin, Poecilodryas albonotata (New Guinea) WW070
Black-throated Robin, Luscinia obscura, (China) XX274
Dusky Flycatcher, Empidonax wrightii, (North America, winters in Guatemala) WN478
Dusky Flycatcher, Muscicapa adusta, (Africa) XX088
Falcated Wren-Babbler, Ptilocichia falcata, (Balabac and Palawan in the Phillipines) YK206
Falcated Wren-Babbler, Kenopia striata, (Malaya, Thailand, Sumatra and Borneo) YK208
Golden-bellied Flycatcher, Myiodynastes hemichrysus, (Costa Rica and Panama) WN754
Golden-bellied Flycatcher, Microeca hemixantha,(Tanimbar in Lesser Sundas) WW012
Grey-headed Woodpecker, Dendropicos spodocephalus, (Sudan, Ethiopia and Tanzania) VH166
Grey-headed Woodpecker, Picus canus, (Eurasia and Sumatra) VH396
Grey-throated White-Eye, Zosterops rendovae, (Bougainville, San Cristobal and Guadalcanal in Solomon Islands) YG120
Grey-throated White-Eye, Lophozosterops javanicus, (Java and Bali) YG164
Little Grey Flycatcher, Bradornis pumilus, (Sudan, Ethiopia, Somalia and Tanzania) XX008
Little Grey Flycatcher, Muscicapa epulata, (western and central Africa) XX090
Olive Flycatcher, Mitrephanes olivaceus, (Peru and Bolivia) WN436
Olive Flycatcher, Microeca flavovirescens, (New Guinea, Aru, Yapen and Papuan islands) WW018
White-eared Honeyeater, Lichenostomus leucolis, (southwestern Australia) WU150
White-eared Honeyeater, Myza sarasinorum, (Sulawesi) WU280
White-tailed Blue-Flycatcher, Elminia albicauda, (southcentral Africa) XC094
White-tailed Blue-Flycatcher, Cyornis concretus, (Burma, SE Asia, Sumatra and Borneo) XX194
* The code numbers are my invention for easier referencing in my Clements Checklist.