yen (n.1) Look up yen at Dictionary.com
Japanese monetary unit, 1875, from Japanese yen, from Chinese yuan "round, round object, circle, dollar."
yen (n.2) Look up yen at Dictionary.com
"sharp desire, hunger," 1906, earlier yen-yen (1900), yin (1876) "intense craving for opium," from Chinese (Cantonese) yan "craving," or from a Beijing dialect word for "smoke." Reinforced in English by influence of yearn.