Jung, the surname of Swiss psychiatrist and founder of the school of analytical psychology, is pronounced as Yung. The letter "j" is always said in Swiss-German as a "y" sound in English.
The Swiss German alphabet consists of the same 26 characters as in English. There is also the addition of a diacritical mark, the "umlaut." Most German vocabulary is derived from the Germanic branch of the Indo-European language family.
Swiss German words are generally accented on the first syllable.
The t is unaspirated, making it sound more like d.
Swiss German uses a guttural r, similar to that used by French; not a growling "r" as in English.
See Phantomranch.net's Swiss Pronunciation Guide to learn more.
To know more about the life of Carl Jung, see links below: