https://en.wiktionary.org/wiki/%CE%B3%CF%8D%CF%81%CE%BF%CF%82#Greek https://en.wiktionary.org/wiki/%CE%B3%CF%8D%CF%81%CE%BF%CF%8... ʝ is the voiced counterpart

https://en.wiktionary.org/wiki/%CE%B3%CF%8D%CF%81%CE%BF%CF%82#Greek https://en.wiktionary.org/wiki/%CE%B3%CF%8D%CF%81%CE%BF%CF%8... ʝ is the voiced counterpart of ç (the ch in "ich"), so you might be able to get pretty close by pronouncing it "Chiros" but buzzing your voice box during the initial consonant.