The anthroponym "Plachenda" is first mentioned in 1671 in the village of Zavadka in the Mizhhiria district. According to research, its form "Placsenda Kozma" is cited in the source Belay 221. The name is likely a phonetic variant of the word "plačynda," which means "crybaby" or "whiner." This word is formed from the base of the verb "plakaty" (to cry) using the augmentative formative "-ynda."