"Do you carry a knife? Just wondering if many folks carry a knife as a secondary defense weapon."
Usually two. One dedicated for strong-side in-fight access and one dedicated to either hand in-fight access. Always the strong-side one.
Meriam Webster's: Main Entry: ci·vil·ian Pronunciation: \sə-ˈvil-yən also -ˈvi-yən\, Function: noun, Date: 14th century, 1: a specialist in Roman or modern civil law, 2 a: one not on active duty in the armed services or not on a police or firefighting force b: outsider 1, — civilian adjective