Xú Kǎn 徐侃, a Lǚ Zǔqiān disciple of the Wùzhōu Lìzhái-academy circle. Listed by the Sìkù editors among the candidates (with 徐僑 Xú Qiáo and Xú Zhuō) for the unidentified “Xú Zǒnggàn” author of Yì chuán dēng (KR1a0044). No further biographical data preserved.