Japanese yen
Pronunciation and etymology

The name, "Yen", derives from the Japanese word 圓 (en,; "round"), which borrows its phonetic reading from Chinese yuan, similar to North Korean won and South Korean won. Originally, the Chinese had traded silver in mass called sycees, and when Spanish and Mexican silver coins arrived from the Philippines, the Chinese called them "silver rounds" (Chinese: 銀圓; pinyin: yínyuán) for their circular shapes. The coins and the name also appeared in Japan. While the Chinese eventually replaced 圆; 圓 with 元, the Japanese continued to use the same word, which was given the shinjitai form 円 in reforms at the end of World War II.

The spelling and pronunciation "yen" is standard in English, because when Japan was first encountered by Europeans around the 16th century, Japanese /e/ (え) and /we/ (ゑ) both had been pronounced and Portuguese missionaries had spelled them "ye". By the middle of the 18th century, /e/ and /we/ came to be pronounced as in modern Japanese, although some regions retain the pronunciation. Walter Henry Medhurst, who had neither been to Japan nor met any Japanese people, having consulted mainly a Japanese-Dutch dictionary, spelled some "e"s as "ye" in his An English and Japanese, and Japanese and English Vocabulary (1830). In the early Meiji era, James Curtis Hepburn, following Medhurst, spelled all "e"s as "ye" in his A Japanese and English dictionary (1867); in Japanese, e and i are slightly palatalized, somewhat as in Russian. That was the first full-scale Japanese-English/English-Japanese dictionary, which had a strong influence on Westerners in Japan and probably prompted the spelling "yen". Hepburn revised most "ye"s to "e" in the 3rd edition (1886) to mirror the contemporary pronunciation, except "yen".
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