The story
- Proto-Indo-European*dʰeh₁-
- Proto-Italic*θakos
- English today-ify
From Middle English -ifien, from Old French -ifier, from Latin -ificāre, from -ficus, from faciō (“to make, do”). For example, purify from purificare, from purificus.
Etymology from Wiktionary, CC BY-SA 4.0.