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Last name Prasil (Prasil , ประสงค์ศิล ) , worldwide, is a rare surname. The cognomen Prasil is characteristic of Czechia, where it is quite a rare surname, Slovakia, where it is a rare surname, and Austria. Measured by absolute frequency, the name is most common in Czechia, the United States, and Slovakia. Much less frequently, Prasil is the forename as well as the last name.