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Surname Holun (Holun ) , all over the world, is an extremely rare family name. Much more prevalently, Holun is the forename as well as the last name.
Голун, Голунь, and ホルン
So, Yeung, Leung, Cheng, Wong, Tsui, Tang, Kwok, Kong, Chiu, Chan, Shum, Lee, Lai, Lau, Ho, Cheung, and Kungkho