Where does “چار” come from?

چار (Central Kurdish) comes from Proto-Iranian čaθwā́rah, from Proto-Indo-Iranian čatwā́ras, from Proto-Indo-European kʷetwóres, from Proto-Indo-European kʷe- — and.

Ancestry of “چار”, step by step

Step	Language	Word	Meaning
1	Proto-Iranian	čaθwā́rah	four
2	Proto-Indo-Iranian	čatwā́ras	four
3	Proto-Indo-European	kʷetwóres	four
4	Proto-Indo-European	kʷe-	and

Every word from Proto-Indo-European kʷe- →Every word from Proto-Indo-European kʷetwóres →Every word from Proto-Indo-Iranian čatwā́ras →