Kohen (1993:22) describes two dialects of Darug S64: the coastal Eora dialect and the inland dialect, spoken by the 'woods tribes', the bediagal-tuagal-tugara. He does not give a name for this dialect.

According to Attenbrow (2002:34-35), some anthropologists and linguists used this term as a group or language name, but there is no evidence to suggest that Aboriginal people used the term Eora to refer to a specific group or language. Attenbrow says that this term is now used to refer to the original inhabitants of the area between Port Jackson and Botany Bay, or sometimes the entire Sydney region, and the language of this area is a (coastal) dialect of Darug S64.

Steele (2005:5-6) also says that Eora is neither language nor people name but simply the word for 'man'. He proposes Biyal-Biyal as an alternative name, explaining the reasoning for this and taking, as support, a quote from Meston in Smith (2004:3): 'but they were not speaking the old Beeahlba dialect of the Sydney blacks'.

Troy describes two dialects of the Sydney language, she indicates that neither Dharug (S64) nor Eora S61 are in the historical record as language names; written variations of the word Eora are defined as 'people, Aboriginal people' (2019: 37).