Concise Bible Dictionary:
Designation of Sanballat, probably as a native of Horonaim or of Beth-horon (Neh. 2:10, 19; Neh. 13:28).
Jackson’s Dictionary of Scripture Proper Names:
troglodite: gentilic of Horonaim or of Beth-horon
Potts’ Bible Proper Names:
Anger; indignation:―the designation of Sanballat; one from Horonaim, Neh. 2:10. {Ira}