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Worldwide, 大介 (Daisuke , Nishio , 大介 ) is quite a common boy's first name. The forename 大介 is habitual in Japan, where it is quite a rare male name, Singapore, where it is a rare masculine name, and Australia. Not in comparison with a country's population, it is the most numerous in Japan, China, and Indonesia. Also, 大介 is the last name as well as the forename.
大介 is also a name for the fictitious and mythical characters: Daisuke Endou , the fictional character from Inazuma Eleven; Daisuke Aramaki , the fictional character from Ghost in the Shell; Daisuke Jigen , the fictional human, Lupin III; Daisuke Kosaka , the fictional character from Oreimo, Ore no Imōto ga Konna ni Kawaii Wake ga Nai and Daisuke Goryō , the fictional character from Atsumare! Fushigi Kenkyū-bu, among other works.