Surname ChanYu (单于) · Origins and Regions — Born Hour

The complete origin of surname ChanYu (单于) and its common regions: 单于原为匈奴最高首领的称号，意为"广大"。西汉时期，部分归附汉朝的匈奴贵族以部落首领称号"单于"为姓，形成此姓。金代女真族中也有人以此为姓，后融入汉族。