The story
- Proto-Indo-European*ḱe?
- Proto-Indo-European*ḱóm
- Proto-Italic*kom
- Proto-Italic*kom-
- Latincon-
- Latinputus
- Latinputō
- Latincomputō
- Anglo-Normancounter
- Middle Englishcounten
- Middle Englishcountable
- English todaycountable
From Middle English countable, equivalent to count (“to enumerate”) + -able.
Etymology from Wiktionary, CC BY-SA 4.0.