Where does “can've” come from?

can've (English) comes from English can, from Spanish can, from Latin Canis, from Ancient Greek δρόμος, from Ancient Greek -ός, from Proto-Hellenic *-os, from Proto-Indo-European -ós — Creates agent nouns from verb stems, denoting...

can've (English): (with have as auxiliary verb)

Definitions

  1. (with have as auxiliary verb)

Ancestry of “can've”, step by step

can've traces back through two separate lines of ancestry.

via English can

StepLanguageWordMeaning
1EnglishcanTo know how to; to be able to; May; to be...
2Spanishcandog, hound
3LatinCanisa dog, a hound animal
4Ancient Greekδρόμοςrace, running; racetrack; course, path
5Ancient Greek-όςForms agentive or patientive adjectives and nouns from the o-grade of a verbal root
6Proto-Hellenic*-os
7Proto-Indo-European-ósCreates agent nouns from verb stems, denoting...

via English ’ve

StepLanguageWordMeaning
1English’vein its sense marking the perfect or retrospective aspect
Every word from Proto-Indo-European -ós