English word whom comes from Proto-Indo-European *kʷey, Proto-Indo-European *kʷís
| Dictionary entry | Language | Definition |
|---|---|---|
| *kʷey | Proto-Indo-European (ine) | |
| *kʷís | Proto-Indo-European (ine) | Who, what (interrogative). Who, which, that (relative) Which, what. |
| *hwat | Proto-Germanic (gem-pro) | |
| hwǣm | Old English (ca. 450-1100) (ang) | |
| hwam | Old English (ca. 450-1100) (ang) | |
| wham | Middle English (1100-1500) (enm) | |
| whom | English (en) | Him; her; them (used as a relative pronoun to refer to a previously mentioned person or people.). What person or people; which person or people, as the object of a preposition.. What person or people; which person or people, as the object of a verb. |