Where does “கொக்குவில்” come from?

கொக்குவில் (Tamil) comes from Tamil வில், from Proto-Dravidian *wil — bow.

Ancestry of “கொக்குவில்”, step by step

கொக்குவில் traces back through two separate lines of ancestry.

via Tamil வில்

StepLanguageWordMeaning
1Tamilவில்bow
2Proto-Dravidian*wilbow

via Tamil கொக்கு

StepLanguageWordMeaning
1Tamilகொக்குstork, heron, paddybird
Every word from Proto-Dravidian *wil →Every word from Tamil வில் →