Where does “thank you” come from?

thank you (English) comes from English thank-you, from English You, from Middle English yow, from Old English ēow, from Proto-West Germanic iwwiz, from Proto-Germanic izwiz, from Proto-Germanic *jūz, from Proto-Indo-European túh₂ — you, thou.

thank you (English): An expression of gratitude or politeness in...

Definitions

  1. An expression of gratitude or politeness in...

Ancestry of “thank you”, step by step

thank you traces back through two separate lines of ancestry.

via English thank-you

StepLanguageWordMeaning
1Englishthank-youAn expression of gratitude; That expresses thanks
2EnglishYouHonorific alternative letter-case form of you,...
3Middle EnglishyowSecond-person plural object pronoun: you;...
4Old EnglishēowWo!, Alas!; sheep
5Proto-West Germaniciwwiz—
6Proto-Germanicizwizaccusative/dative/instrumental of *jūz
7Proto-Germanic*jūz—
8Proto-Indo-Europeantúh₂you, thou

via English I thank you

StepLanguageWordMeaning
1EnglishI thank you—

Words derived from “thank you”

Every word from Proto-Indo-European túh₂ →Every word from Proto-Germanic *jūz →Every word from Proto-Germanic izwiz →