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Kursav (also known as Faita or Kulsab) is a divergent and nearly extinct Madang language of the Adelbert Range of Papua New Guinea. It was once placed in the now-defunct Brahman branch of Madang. Daniels (2017) identifies Gants as its closest relative.
Daniels, Don. 2017. Gants is a Sogeram Language. Language and Linguistics in Melanesia 35: 82-93.
Sources
Daniels, Don. 2015. A Reconstruction of Proto-Sogeram: Phonology, Lexicon, and Morphosyntax. Doctoral dissertation, University of California at Santa Barbara.