Middle English word hoo comes from Proto-Indo-European *ḱoy-, Proto-Indo-European *kū-, Old Norse hó!, and later Proto-Germanic *hijō (She;.)
| Dictionary entry | Language | Definition |
|---|---|---|
| *ḱoy- | Proto-Indo-European (ine-pro) | |
| *kū- | Proto-Indo-European (ine-pro) | |
| hó! | Old Norse (non) | |
| *hijō | Proto-Germanic (gem-pro) | She;. |
| *kūk- | Proto-Indo-European (ine-pro) | |
| hīo | Old English (ang) | |
| *hauhaz | Proto-Germanic (gem-pro) | High. |
| *haugaz | Proto-Germanic (gem-pro) | Hill. |
| haugr | Old Norse (non) | Cairn; sacrificial mound. Howe, mound; dung heap, midden. |
| ho | Middle English (enm) | Who. |