| 1 | English | thank you | An expression of gratitude or politeness in... |
| 2 | English | thank-you | An expression of gratitude; That expresses thanks |
| 3 | English | You | Honorific alternative letter-case form of you,... |
| 4 | Middle English | yow | Second-person plural object pronoun: you;... |
| 5 | Old English | ēow | Wo!, Alas!; sheep |
| 6 | Proto-West Germanic | iwwiz | — |
| 7 | Proto-Germanic | izwiz | accusative/dative/instrumental of *jūz |
| 8 | Proto-Germanic | *jūz | — |
| 9 | Proto-Indo-European | túh₂ | you, thou |