The descendants of the Yokoi clan include Shonan YOKOI, a statesman of Kumamoto in the late Edo period who was invited by the Matsudaira family of the Echizen (present-day Fukui Prefecture) domain where he became influential in politics.
横井氏の子孫からは、幕末の熊本藩士で越前藩越前松平家に派遣され活躍した横井小楠が出る。