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Family name Lyas (Lyas , Лясь ) , worldwide, is quite a rare cognomen. The last name Lyas is characteristic of Algeria, where it is quite a rare surname, Bahrain, where it is a rare surname, and Lebanon. Measured by absolute frequency, this name is the most popular in Algeria, Ivory Coast, and the United States. More frequently, Lyas is the forename as well as the last name.