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Cognomen Grae (Grae , グレイ ) , around the world, is a rare family name. The family name Grae is characteristic of Lithuania, where it is quite a rare surname, Slovakia, where it is a rare surname, and Ireland. Not in comparison with a country's population, this name is the most popular in Germany, the United States, and Japan. Also, Grae is the forename as well as the last name.