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Last name Gelas (Glass , Gelas , Glas ) , around the globe, is a common surname. The last name Gelas is habitual in Guernsey, where it is quite a common surname, New Zealand, and the United States (explore the name in all countries). Measured by absolute frequency, this name is the most popular in the United States, Germany, and the United Kingdom. Very seldom, Gelas is the forename as well as the last name.