Where does “pnc” come from?

pnc (Middle Persian) comes from Proto-Iranian pánča, from Proto-Indo-Iranian pánča, from Proto-Indo-European pénkʷe — five.

Ancestry of “pnc”, step by step

StepLanguageWordMeaning
1Proto-Iranianpánčafive
2Proto-Indo-Iranianpánčafive
3Proto-Indo-Europeanpénkʷefive
Every word from Proto-Indo-European pénkʷe →Every word from Proto-Indo-Iranian pánča →Every word from Proto-Iranian pánča →