Middle English word yo comes from Proto-Indo-European *yē, Proto-Indo-European *yo-, Proto-Indo-European *yū́ (You (plural).), Proto-Germanic *ga-, Proto-Germanic *awjō (A floodplain; meadow. Island.), Old English eow
| Dictionary entry | Language | Definition |
|---|---|---|
| *yē | Proto-Indo-European (ine-pro) | |
| *yo- | Proto-Indo-European (ine-pro) | |
| *yū́ | Proto-Indo-European (ine-pro) | You (plural). |
| *ga- | Proto-Germanic (gem-pro) | Indicates association or togetherness; co-.. Indicates completeness or wholeness. In verbs, also indicates perfectivity (a finished action). |
| *awjō | Proto-Germanic (gem-pro) | A floodplain; meadow. Island. |
| eow | Old English (ang) | Expression of grief, sorrow, or surprise Wo!; Alas! You: accusative/dative plural form of þū. |
| *jūz | Proto-Germanic (gem-pro) | You (plural). |
| *ja | Proto-Germanic (gem-pro) | And (conjunctive particle). Thus, so. Yes (confirmation particle). |
| ġē | Old English (ang) | |
| *gaawją | Proto-Germanic (gem-pro) | |
| *gawi | Proto-Germanic (gem-pro) | District, shire, region, area. |
| iā | Old English (ang) | |
| ȝe | Middle English (enm) |