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Last name Yenn (Yenn ) , in all the world, is quite a rare cognomen. The family name Yenn is characteristic of Malaysia, where it is quite a rare surname, Norway, where it is a rare surname, and Singapore, where it is a very rare surname. Measured by absolute frequency, the name is most common in Malaysia, Indonesia, and the United States. Likewise, Yenn is the forename as well as the last name.