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Surname Kailyan (Kailyan ) , across the world, is an extremely rare cognomen. Much more frequently, Kailyan is the forename as well as the last name.
Каилян, Кайлян, and Каілян
Ray, Thakuria, Baishya, Sonowal, Malakar, Konwar, Kalita, Choudhury, Barman, Sarkar, Gogoi, Nath, Deka, Das, Roy, Baruah, and Theresine