Where does “sidi” come from?

sidi (Middle Dutch) comes from Middle Dutch gī, from Old Dutch gī, from Proto-West Germanic jiʀ, from Proto-Germanic jīz, from Proto-Indo-European *yúHs — you (plural).

Ancestry of “sidi”, step by step

StepLanguageWordMeaning
1Middle Dutchgīyou nominative, plural
2Old Dutchgīyou plural
3Proto-West Germanicjiʀyou
4Proto-GermanicjīzAlternative form of *jūz
5Proto-Indo-European*yúHsyou (plural)
Every word from Proto-Indo-European *yúHs →Every word from Proto-Germanic jīz →Every word from Proto-West Germanic jiʀ →