This is one of the Woi wurrung S36 clans (Clark, 1990:383).
Tindale considers this to be a Wathaurung S29 group and says their language is called Jibberin. Jibberin appears to come from a word list in Curr (1887) entitled 'Moorabool-Jibberin language', but Oates (1975:411) identifies it as a Jarra S31.1 word list.
Based on the information available, Kurung is unlikely to be a language name.
... west side of Port Phillip Bay between Werribee River and Geelong; inland up Moorabool River to Dividing Range; westward toward Ballarat; at Ballan (Tindale 1974).
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Speaker numbers were measured differently across the censuses and various other sources listed in AUSTLANG. You are encouraged to refer to the sources.
Speaker numbers for ‘NILS 2004’ and ‘2005 estimate’ come from 'Table F.3: Numbers of speakers of Australian Indigenous languages (various surveys)' in 'Appendix F NILS endangerment and absolute number results' in McConvell, Marmion and McNicol 2005, pages 198-230 (PDF, 2.5MB).