From Jurchen *bi, which came from Proto-Tungusic *bi, whence Evenki би (bi), Even би (ʙi), Negidal би, Oroch би, Nanai ми (mi), Orok би, Ulch би, and Udihe би (bi).
Compare also Mongolian би (bi), from Proto-Mongolic *bi and Proto-Turkic *ben (“I”). (Can this(+) etymology be sourced?)
ᠪᡳ • (bi)
| Number | Person | Clusivity | Nominative | Genitive | Dative | Accusative | Ablative |
|---|---|---|---|---|---|---|---|
| Singular | First | — | ᠪᡳ (bi) | ᠮᡳᠨᡳ (mini) | ᠮᡳᠨᡩᡝ (minde) | ᠮᡳᠮᠪᡝ (mimbe) | ᠮᡳᠨᠴᡳ (minci) |
| Second | — | ᠰᡳ (si) | ᠰᡳᠨᡳ (sini) | ᠰᡳᠨᡩᡝ (sinde) | ᠰᡳᠮᠪᡝ (simbe) | ᠰᡳᠨᠴᡳ (sinci) | |
| Third | — | ᡳ (i) | ᡳᠨᡳ (ini) | ᡳᠨᡩᡝ (inde) | ᡳᠮᠪᡝ (imbe) | ᡳᠨᠴᡳ (inci) | |
| Plural | First | Exclusive | ᠪᡝ (be) | ᠮᡝᠨᡳ (meni) | ᠮᡝᠨᡩᡝ (mende) | ᠮᡝᠮᠪᡝ (membe) | ᠮᡝᠨᠴᡳ (menci) |
| Inclusive | ᠮᡠᠰᡝ (muse) | ᠮᡠᠰᡝᡳ (musei) | ᠮᡠᠰᡝᡩᡝ (musede) | ᠮᡠᠰᡝᠪᡝ (musebe) | ᠮᡠᠰᡝᠴᡳ (museci) | ||
| Second | — | ᠰᡠᠸᡝ (suwe) | ᠰᡠᠸᡝᠨᡳ (suweni) | ᠰᡠᠸᡝᠨᡩᡝ (suwende) | ᠰᡠᠸᡝᠮᠪᡝ (suwembe) | ᠰᡠᠸᡝᠨᠴᡳ (suwenci) | |
| Third | — | ᠴᡝ (ce) | ᠴᡝᠨᡳ (ceni) | ᠴᡝᠨᡩᡝ (cende) | ᠴᡝᠮᠪᡝ (cembe) | ᠴᡝᠨᠴᡳ (cenci) |