It is highly unlikely that any black númenóreans would have called themselves Ciryedain due to the tendecy of the Kingsmen to avoid the elven tongues the Name Ciryedain perhaps must be taken as an invention on gondorian Loremasters who still knew the Quenya name of the former colony from old sources and had applied this name to their removed cousins of the south.Since Tar-Ciryatan´s adûnaic name was Ar-Balkumagân, ciryatandor´s actual adûnaic might have been thâni anBalkumagân or Balkumagânzâyan and the Ciryedain might have called themselves Balkumagânâim.However Hands of the Healer gives an alternate name of the country as Anbalukkhor, maybe a corrupted Form from ansith, the common speech of Far-Harad?