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Family name Tonai (Tonai
, トウナイ
, Тонаи) , throughout the world, is a rare surname. The cognomen Tonai is characteristic of Croatia, where it is a rare surname, Hungary, and Singapore, where it is a very rare surname. Measured by absolute frequency, it is commonest in India, the United States, and Hungary. More frequently, Tonai is the forename as well as the last name.