Friedman, Victor (1988), “Elementary Georgian Obscenity”, in Maledicta‎, volume 10, page 37 of 37-42 

Dondua, Ḳarṗez (2001), “ყლავ”, in Svanur-kartul-rusuli leksiḳoni (lašxuri dialekṭi) [Svan–Georgian–Russian Dictionary (Lashkh dialect)] (Kartvelologiuri biblioteḳa; 6), revised and prepared for publication by Aleksandre Oniani, Tbilisi: Tbilisi State Pedagogical University Press, page 327b
Liṗarṭeliani, Aslan (1994), “ყლავ”, in Svanuri leksiḳoni (čoluruli ḳilo) [Svan-Georgian dictionary (Cholur dialect)], Tbilisi, page 299b

According to Klimov, from Proto-Kartvelian *q̇le (“penis”). Čuxua together with dialectal Georgian ღლავი (ɣlavi, “young boy”) derives from Proto-Kartvelian *ɣlaw-; for the word-initial Svan ყ (q̇) ~ Georgian ღ (ɣ) correspondence, compare Proto-Kartvelian *q̇wiz₁- 'liver', *q̇welp- '(hot) ashes'

Klimov, G. A. (1998), Etymological Dictionary of the Kartvelian Languages (Trends in linguistics. Documentation; 16), New York, Berlin: Mouton de Gruyter, pages 243–244
Čuxua, Merab (2018), “Axali masalebi kartuli enis isṭoriul-eṭimologiuri leksiḳonisatvis [New Materials for the Georgian Historical-Etymological Dictionary]”, in Eṭimologiuri ʒiebani (in Georgian), volume XV, Tbilisi, pages 110–111 

The Linguistic Center of Yogyakarta (2011), “kacuk”, in Kamus Basa Jawa (Bausastra Jawa), 2nd edition, Yogyakarta: Kanisius

Etymology uknown, probably from cucuk 'beak, bill' +‎ ka- 

Buginese laso penis, Chamorro læsoʔ testicle, penis,  Kambera lahu penis, Lau lasu- penis, Manggarai laso penis, Manobo (Ata) lasuʔ penis, Manobo (Western Bukidnon) lasuʔ penis, Ngadha lasu penis, Rembong lasoʔ penis, Sasak laso penis, Wolio lasu penis