Where does “ਚਾਕ਼ੂ” come from?

ਚਾਕ਼ੂ (Punjabi) comes from Classical Persian چَاقُو, from Persian چاکو, from Middle Persian ckwc, from Avestan 𐬗𐬀𐬐𐬎𐬱, from Proto-Indo-European keku- — cudgel, hammer shaped stick.

ਚਾਕ਼ੂ (Punjabi): penknife, knife

Definitions

penknife, knife

Ancestry of “ਚਾਕ਼ੂ”, step by step

Step	Language	Word	Meaning
1	Classical Persian	چَاقُو	—
2	Persian	چاکو	—
3	Middle Persian	ckwc	hammer
4	Avestan	𐬗𐬀𐬐𐬎𐬱	battle-axe
5	Proto-Indo-European	keku-	cudgel, hammer shaped stick

Every word from Proto-Indo-European keku- →Every word from Avestan 𐬗𐬀𐬐𐬎𐬱 →Every word from Middle Persian ckwc →