English word yo comes from Proto-Germanic *jūz (You (plural).), Proto-Indo-European *yē, Proto-Indo-European *yo-, Proto-Germanic *gaawją, Old English (ca. 450-1100) eow
| Dictionary entry | Language | Definition |
|---|---|---|
| *jūz | Proto-Germanic (gem-pro) | You (plural). |
| *yē | Proto-Indo-European (ine) | already |
| *yo- | Proto-Indo-European (ine) | |
| *gaawją | Proto-Germanic (gem-pro) | |
| eow | Old English (ca. 450-1100) (ang) | Expression of grief, sorrow, or surprise Wo!; Alas! You: accusative/dative plural form of þū. |
| ġē | Old English (ca. 450-1100) (ang) | |
| *gawi | Proto-Germanic (gem-pro) | District, shire, region, area. |
| *ja | Proto-Germanic (gem-pro) | And (conjunctive particle). Thus, so. Yes (confirmation particle). |
| iā | Old English (ca. 450-1100) (ang) | |
| ȝe | Middle English (1100-1500) (enm) | |
| yo | English (en) | (military slang) Present! Here!. (slang) A greeting similar to hi.. (slang) An interjection similar to hey. |