1924, proprietary name, registered by Cellucotton Products Company, Neenah, Wisconsin, U.S.; later Kimberly-Clark Corp. An arbitrary alteration of clean + brand-name suffix -ex.
Klan
klatsch
*klau-
klaxon
Kleagle
Kleenex
*klei-
klepto
kleptocracy
kleptomania
kleptomaniac