Where does “assurer” come from?

I need to work through this chain carefully to construct an accurate etymology sentence. Let me trace the chain from oldest to newest: 1. Proto-Indo-European kʷey- 2. Proto-Indo-European swoyos 3. Latin ad 4. Latin ad- (prefix) 5. Latin ad- (prefix again) 6. Latin -arius 7. Chinese 兒 8. English assure 9. English assurer (the headword) Wait, this chain seems problematic. Let me reconsider: The chain goes from newest to oldest, so I need to reverse it: Oldest to newest: - Proto-Indo-European kʷey- - Proto-Indo-European swoyos - Latin ad - Latin ad- (appears twice) - Latin -arius - Chinese 兒 - English assure - English assurer

assurer (English): An insurer; an underwriter; One who takes out...

Definitions

  1. An insurer; an underwriter; One who takes out...

Ancestry of “assurer”, step by step

StepLanguageWordMeaning
1English-erA person or thing that does an action indicated...
2Middle English-eragentive suffix; agent noun suffix
3Old French-erAlternative form of -ier, verbal suffix;...
4Latin-ārefirst conjugation
5Proto-Italic-āōForms primarily denominative verbs
6Proto-Indo-European-eh₂yétiCreates iterative/ frequentative/ intensive...
7Proto-Indo-European-yétiCreates intransitive, often deponent,...
8Proto-Indo-Europeanyé-
9Chichewaiyehe, she
Every word from Chichewa iyeEvery word from English -erEvery word from Proto-Indo-European -yéti