Wanderwort in the E/SE sprachbund. Compare Chinese 騎/骑, Burmese စီး (ci:), Khmer ជិះ (cih), ꊪ (zy, “to cause to ride”), Thai ขี่ (kìi), Lao ຂີ່ (khī), Zhuang gwih, White Hmong caij, Vietnamese cưỡi, Proto-Austronesian *sakay (“catch a ride, join a group, ride on something”).
ꋩ (zzy)